67

67 (sixty-seven) is the natural number following 66 and preceding 68. It is an odd number.

In mathematics

Sixty-seven is the 19th prime number (the next is 71), an irregular prime, a lucky prime, the sum of five consecutive primes (7 + 11 + 13 + 17 + 19), and a Heegner number.

Since 18! + 1 is divisible by 67 but 67 is not one more than a multiple of 18, 67 is a Pillai prime.

In a Voronoi diagram created using points from the prime spiral, no prime less than 10242 will have a rounder Voronoi cell than 67.

In science

• The atomic number of holmium, a lanthanide

Astronomy

• Messier object M67, a magnitude 7.5 open cluster in the constellation Cancer
• The New General Catalogue object NGC 67, an elliptical galaxy in the constellation Andromeda
• The Saros number of the solar eclipse series which began on -727 February 20 and ended on 571 April. The duration of Saros series 67 was 1298.1 years, and it contained 73 solar eclipses. The Saros number of the lunar eclipse series which began on -660 July 1 and ended on 656 September. The duration of Saros series 67 was 1316.2 years, and it contained 74 lunar eclipses.

Other fields

Sixty-seven is:

• The registry of the U.S. Navy's aircraft carrier USS John F. Kennedy (CV-67), named after U.S. President John F. Kennedy
• The number of the European route E67, the Via Baltica from Prague to Helsinki
• The number of the French department Bas-Rhin
• Chicago's song Questions 67 and 68
• Elton John's song "Old '67" on The Captain & The Kid CD, (2006)
• The number of counties in Florida
• The number of counties in Alabama
• The number of counties in Pennsylvania
• The highest two-digit odd number not presently designating any highway in the Interstate Highway System of the United States.
  • 67 in the US is a common prefix-code for blocking caller-id info on the subsequent call.

In sports

• Buddy Arrington's best-known NASCAR car number
• The Ottawa 67's, founded in 1967
• Fred Davis, an English billiards player won the World Billiards Championship aged 67
• New England Patriots Dan Koppen wears #67
• Minnesota Wild Benoit Pouliot wears #67
• The number of throws in Judo.
• Pekka Koskela skated the 1000 metres in 1:07:00 (67 seconds) on 10 November 2007, a world record at the time.

Historical years

67 A.D., 67 B.C., 1967, 2067, etc.

External links

• A short journey involving 67s:
• http://www.dr-mikes-maths.com/psv/index.html