66 is the natural number

Natural number

In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...

 following 65

65 (number)

65 is the natural number following 64 and preceding 66.-In mathematics:Sixty-five is the 23rd semiprime and the 3rd of the form it is an octagonal number. It is also a Cullen number...

 and preceding 67

67 (number)

67 is the natural number following 66 and preceding 68. It is an odd number.-In mathematics:Sixty-seven is the 19th prime number , an irregular prime, a lucky prime, the sum of five consecutive primes , and a Heegner number.Since 18! + 1 is divisible by 67 but 67 is not one more than a multiple of...

.

Usages of this number include:

Mathematics

• 66 is a sphenic number
  Sphenic number
  In number theory, a sphenic number is a positive integer which is the product of three distinct prime numbers.Note that this definition is more stringent than simply requiring the integer to have exactly three prime factors; e.g. 60 = 22 × 3 × 5 has exactly 3 prime factors, but is not sphenic.All...
  
  , a triangular number
  Triangular number
  A triangular number or triangle number numbers the objects that can form an equilateral triangle, as in the diagram on the right. The nth triangle number is the number of dots in a triangle with n dots on a side; it is the sum of the n natural numbers from 1 to n...
  
  , a hexagonal number
  Hexagonal number
  A hexagonal number is a figurate number. The nth hexagonal number will be the number of points in a hexagon with n regularly spaced points on a side.The formula for the nth hexagonal number...
  
  , and a semi-meandric number. Being a multiple of a perfect number
  Perfect number
  In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself . Equivalently, a perfect number is a number that is half the sum of all of its positive divisors i.e...
  
  , 66 is itself a semiperfect number
  Semiperfect number
  In number theory, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. A semiperfect number that is equal to the sum of all its proper divisors is a perfect number....
  
  .
• Since it is possible to find sequences of 66 consecutive integers such that each inner member shares a factor with either the first or the last member, 66 is an Erdős–Woods number
  Erdos–Woods number
  In number theory, an Erdős–Woods number is a positive integer that has the following property:Consider a sequence of consecutive positive integers [a, a+1, \dots, a+k]. The number k is an Erdős–Woods number if there exists such a sequence, beginning with some number a, in which each of the elements...
  
  .

Astronomy

• Messier object
  Messier object
  The Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771. The original motivation of the catalogue was that Messier was a comet hunter, and was frustrated by objects which resembled but were not comets...
  
   Spiral Galaxy M66, a magnitude 10.0 galaxy
  Galaxy
  A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. The word galaxy is derived from the Greek galaxias , literally "milky", a...
  
   in the constellation
  Constellation
  In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
  
   Leo
  Leo (constellation)
  Leo is one of the constellations of the zodiac. Its name is Latin for lion. Its symbol is . Leo lies between dim Cancer to the west and Virgo to the east.-Stars:...
  
  
• The New General Catalogue
  New General Catalogue
  The New General Catalogue of Nebulae and Clusters of Stars is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects...
  
   object NGC 66, a peculiar
  Peculiar galaxy
  A peculiar galaxy is a galaxy which is unusual in its size, shape, or composition. Peculiar galaxies come about as a result of interactions between galaxies, and they may contain atypical amounts of dust or gas, may have higher or lower surface brightness than a typical galaxy, or may have...
  
   barred spiral galaxy
  Barred spiral galaxy
  A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in approximately two-thirds of all spiral galaxies...
  
   in the constellation Cetus
  Cetus
  Cetus is a constellation. Its name refers to Cetus, a sea monster in Greek mythology, although it is often called 'the whale' today. Cetus is located in the region of the sky that contains other water-related constellations such as Aquarius, Pisces, and Eridanus.-Ecliptic:Although Cetus is not...
  
  
• The Saros number of the solar eclipse
  Solar eclipse
  As seen from the Earth, a solar eclipse occurs when the Moon passes between the Sun and the Earth, and the Moon fully or partially blocks the Sun as viewed from a location on Earth. This can happen only during a new moon, when the Sun and the Moon are in conjunction as seen from Earth. At least...
  
   series which began on 12 March -756 and ended on 1 May 542. The duration of Saros series 66 was 1298.1 years, and it contained 73 solar eclipses.
• The Saros number of the lunar eclipse
  Lunar eclipse
  A lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a...
  
   series which began on 12 August -671 and ended on 27 January 826. The duration of Saros series 66 was 1496.5 years, and it contained 84 lunar eclipses.

Sports

The National Football League

National Football League

The National Football League is the highest level of professional American football in the United States, and is considered the top professional American football league in the world. It was formed by eleven teams in 1920 as the American Professional Football Association, with the league changing...

 retired jersey number 66 for Green Bay Packers

Green Bay Packers

The Green Bay Packers are an American football team based in Green Bay, Wisconsin. They are members of the North Division of the National Football Conference in the National Football League . The Packers are the current NFL champions...

 linebacker Ray Nitschke

Ray Nitschke

Raymond Ernest "Ray" Nitschke was a professional football player who played his entire career as a middle linebacker for the Green Bay Packers of the NFL. Wearing #66, he played fifteen seasons, from 1958-72....

. The last Packer to wear number 66 before it was retired in 1983 to honor Nitschke was offensive tackle Larry Pfohl who is better known to pro wrestling fans as Lex Luger

Lex Luger

Lawrence Wendell "Larry" Pfohl , better known by his ring name Lex Luger, is an American former professional wrestler and football player currently working with WWE on their wellness policy...

.

Jersey number 66 was retired by the Pittsburgh Penguins

Pittsburgh Penguins

The Pittsburgh Penguins are a professional ice hockey team based in Pittsburgh, Pennsylvania. They are members of the Atlantic Division of the Eastern Conference of the National Hockey League . The franchise was founded in 1967 as one of the first expansion teams during the league's original...

 (National Hockey League

National Hockey League

The National Hockey League is an unincorporated not-for-profit association which operates a major professional ice hockey league of 30 franchised member clubs, of which 7 are currently located in Canada and 23 in the United States...

) in honor of Mario Lemieux

Mario Lemieux

Mario Lemieux, OC, CQ is a Canadian former professional ice hockey player. He is acknowledged to be one of the best players of all time. He played 17 seasons as a forward for the Pittsburgh Penguins of the National Hockey League between 1984 and 2006...

.

Computing

66 (more specifically 66.667) megahertz (MHz) is a common divisor for the front side bus

Front side bus

A front-side bus is a computer communication interface often used in computers during the 1990s and 2000s.It typically carries data between the central processing unit and a memory controller hub, known as the northbridge....

 (FSB) speed, overall central processing unit

Central processing unit

The central processing unit is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer. The term has been in...

 (CPU) speed, and base bus speed. On a Core 2 CPU, and a Core 2 motherboard

Motherboard

In personal computers, a motherboard is the central printed circuit board in many modern computers and holds many of the crucial components of the system, providing connectors for other peripherals. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple...

, the FSB is 1066 MHz (~16 x 66 MHz), the memory speed is usually 666.67 MHz (~10 x 66 MHz), and the processor speed ranges from 1.86 gigahertz (GHz) (~66 MHz x 28) to 2.93 GHz (~66 MHz x 44), in 266 MHz (~66 MHz x 4) increments.

Cinema

• Sixty Six (film)
  Sixty Six (film)
  Sixty Six is a 2006 British biographical-comedy-drama film about a bar mitzvah which takes place in London on the day of the 1966 world cup final based on the true life bar mitzvah of director Paul Weiland.- Plot :...
  
   is a 2006 British movie about a barmitzvah in London on the day of the 1966 World Cup final
  1966 FIFA World Cup
  The 1966 FIFA World Cup, the eighth staging of the World Cup, was held in England from 11 July to 30 July. England beat West Germany 4–2 in the final, winning the World Cup for the first time, so becoming the first host to win the tournament since Italy in 1934.-Host selection:England was chosen as...
  
  .

• In the Star Wars
  Star Wars
  Star Wars is an American epic space opera film series created by George Lucas. The first film in the series was originally released on May 25, 1977, under the title Star Wars, by 20th Century Fox, and became a worldwide pop culture phenomenon, followed by two sequels, released at three-year...
  
  movie series, Order 66 is a prepared order to the clone troopers to kill the Jedi
  Jedi
  The Jedi are characters in the Star Wars universe and the series's main protagonists. The Jedi use a power called the Force and weapons called lightsabers, which emit a controlled energy flow in the shape of a sword, in order to serve and protect the Republic and the galaxy at large from conflict...
  
   commanding them

Television

• Route 66
  Route 66 (TV series)
  Route 66 is an American TV series in which two young men traveled across America. The show ran weekly on CBS from 1960 to 1964. It starred Martin Milner as Tod Stiles and, for two and a half seasons, George Maharis as Buz Murdock. Maharis was ill for much of the third season, during which time Tod...
  
   was a popular US television series on CBS
  CBS
  CBS Broadcasting Inc. is a major US commercial broadcasting television network, which started as a radio network. The name is derived from the initials of the network's former name, Columbia Broadcasting System. The network is sometimes referred to as the "Eye Network" in reference to the shape of...
  
   from 1960 to 1964.

Other fields

• The designation of the historic U.S. Route 66
  U.S. Route 66
  U.S. Route 66 was a highway within the U.S. Highway System. One of the original U.S. highways, Route 66 was established on November 11, 1926 -- with road signs erected the following year...
  
  , dubbed the "Mother Road" by novelist John Steinbeck
  John Steinbeck
  John Ernst Steinbeck, Jr. was an American writer. He is widely known for the Pulitzer Prize-winning novel The Grapes of Wrath and East of Eden and the novella Of Mice and Men...
  
  
• The designation of US Interstate 66
  Interstate 66
  Interstate 66 is an Interstate Highway in the eastern United States. As indicated by its even route number, it runs in an east–west direction. Its western terminus is at Middletown, Virginia, at an intersection with Interstate 81; its eastern terminus is in Washington, D.C., at an...
  
  , a freeway that runs from Virginia
  Virginia
  The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
  
   to Washington, D.C.
  Washington, D.C.
  Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....
  
  
• The designation of 36 US state
  State highway
  State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...
  
   and 2 territorial highways (see list of highways numbered 66)
• Phillips 66
  Phillips 66
  Phillips 66 is a brand of gasoline and service station in the U.S. It is owned by the ConocoPhillips Company.Phillips 66 will also be the name of the future downstream company created when ConocoPhillips repositions its integrated assets and businesses into two independent, publicly-traded...
  
  , a brand of gasoline
  Gasoline
  Gasoline , or petrol , is a toxic, translucent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. Some gasolines also contain...
  
   and service station
  Filling station
  A filling station, also known as a fueling station, garage, gasbar , gas station , petrol bunk , petrol pump , petrol garage, petrol kiosk , petrol station "'servo"' in Australia or service station, is a facility which sells fuel and lubricants...
  
   in the United States
• The international direct dialing (IDD) code for Thailand
  Thailand
  Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
  
  
• The number of the French department Pyrénées-Orientales
  Pyrénées-Orientales
  Pyrénées-Orientales is a department of southern France adjacent to the northern Spanish frontier and the Mediterranean Sea. It also surrounds the tiny Spanish enclave of Llívia, and thus has two distinct borders with Spain.- History :...
  
  
• Municipal Okrug #66, name of Chyornaya rechka Municipal Okrug of Primorsky District of Saint Petersburg
  Saint Petersburg
  Saint Petersburg is a city and a federal subject of Russia located on the Neva River at the head of the Gulf of Finland on the Baltic Sea...
  
  , Russia, until 2008
• The name of a German
  Germany
  Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
  
   card game
  Card game
  A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games...
  
  , translated from sechsundsechzig
  Sechsundsechzig
  Sixty-six or Schnapsen is a fast 5- or 6-card point-trick game of the marriage type for 2–4 players, played with 20 or 24 cards. First recorded in 1718 under the name Mariagen-Spiel, it is the national card game of Austria and also popular in Germany and Hungary.Closely related games for various...
  
  
• The name of a card game
  Card game
  A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games...
  
   derived from the German
  Germany
  Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
  
   card game
  Card game
  A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games...
  
  , Sixty-six (game)
• The total number of books in the Protestant edition of the Bible
  Bible
  The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...
  
   (Old Testament
  Old Testament
  The Old Testament, of which Christians hold different views, is a Christian term for the religious writings of ancient Israel held sacred and inspired by Christians which overlaps with the 24-book canon of the Masoretic Text of Judaism...
  
   and New Testament
  New Testament
  The New Testament is the second major division of the Christian biblical canon, the first such division being the much longer Old Testament....
  
  ) combined
• The total number of chapters in the Bible
  Bible
  The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...
  
   book of Isaiah
  Isaiah
  Isaiah ; Greek: ', Ēsaïās ; "Yahu is salvation") was a prophet in the 8th-century BC Kingdom of Judah.Jews and Christians consider the Book of Isaiah a part of their Biblical canon; he is the first listed of the neviim akharonim, the later prophets. Many of the New Testament teachings of Jesus...
  
  
• The number of verses in Chapter 3 of the book of Lamentations
  Book of Lamentations
  The Book of Lamentations ) is a poetic book of the Hebrew Bible composed by the Jewish prophet Jeremiah. It mourns the destruction of Jerusalem and the Holy Temple in the 6th Century BCE....
  
   in the Old Testament
  Old Testament
  The Old Testament, of which Christians hold different views, is a Christian term for the religious writings of ancient Israel held sacred and inspired by Christians which overlaps with the 24-book canon of the Masoretic Text of Judaism...
  
  
• In Abjad numerals
  Abjad numerals
  The Abjad numerals are a decimal numeral system in which the 28 letters of the Arabic alphabet are assigned numerical values. They have been used in the Arabic-speaking world since before the 8th century Arabic numerals...
  
  , The Name Of Allah (الله) numeric value is 66
• In Telecommunications a 66 block
  66 block
  A 66 block is a type of punchdown block used to connect sets of wires in a telephone system. 66 blocks are designed to terminate 22 through 26 AWG solid copper wire....
  
   is used to organize telephone lines
• 66 is the number of hot dogs eaten by World record holder Joey Chestnut
  Joey Chestnut
  Joseph Christian "Jaws" Chestnut is an American competitive eater. The , engineering student is currently ranked first in the world by the International Federation of Competitive Eating...
  
   in 15 minutes at the Nathan's Hot Dog Eating Championships in 2007
• Sergio Mendes and Brazil '66 was a sixties group
• 66 WNBC radio
  WFAN
  WFAN , also known as "Sports Radio 66" or "The FAN", is a radio station in New York City. The station broadcasts on a clear channel and is owned by CBS Radio...
  
   was a popular New York radio station, which became WFAN
  WFAN
  WFAN , also known as "Sports Radio 66" or "The FAN", is a radio station in New York City. The station broadcasts on a clear channel and is owned by CBS Radio...
  
   on 1 July 1987
• Lil B
  Lil B
  Brandon McCartney , known by his stage name Lil B or "The BasedGod", is a rapper from Berkeley, California. He has recorded both solo and with the Pack. In addition, Lil B is noted for his extensive use of social media Web sites such as MySpace and Twitter to build an online following.-Early...
  
   has a song entitled OMG 66.
• Le 66
  Le 66
  Le 66 is an opérette in one act of 1856 with music by Jacques Offenbach. The French libretto was by Pittaud de Forges and Laurencin...
  
  is an opérette in one act of 1856 with music by Jacques Offenbach
  Jacques Offenbach
  Jacques Offenbach was a Prussian-born French composer, cellist and impresario. He is remembered for his nearly 100 operettas of the 1850s–1870s and his uncompleted opera The Tales of Hoffmann. He was a powerful influence on later composers of the operetta genre, particularly Johann Strauss, Jr....
  
   and a French
  French language
  French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...
  
   libretto by Pittaud de Forges and Laurencin.

Anime/Manga

• In the videogame Fullmetal Alchemist
  Fullmetal Alchemist
  , is a Japanese manga series written and illustrated by Hiromu Arakawa. The world of Fullmetal Alchemist is styled after the European Industrial Revolution...
  
  , elusive villain Barry the Chopper is imprisoned in cell number 66, which later becomes his alias when battling the brothers at Laboratory Five.