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

In mathematics

67 is:

• the 19th prime number (the next is 71).
• a Chen prime.^[1]
• an irregular prime.^[2]
• a lucky prime.^[3]
• the sum of five consecutive primes (7 + 11 + 13 + 17 + 19).
• a Heegner number.^[4]
• a Pillai prime since 18! + 1 is divisible by 67, but 67 is not one more than a multiple of 18.^[5]
• palindromic in quinary (232₅) and senary (151₆).
• a super-prime. (19 is prime)
• an isolated prime. (65 and 69 are not prime)

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.

In music

• "Car 67", a song by the band Driver 67
• Chicago's song "Questions 67 and 68"
• Elton John's song "Old '67" on The Captain & The Kid CD, (2006)
• British rap group called 67
• Rapper Drake released the song named "Star67" off his album If You're Reading This It's Too Late

In 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 French department Bas-Rhin.
• The number of counties in Alabama, Florida, and Pennsylvania.
• The province/traffic code of Zonguldak Province in Turkey.
• In the U.S., *67 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.
• Pekka Koskela skated the 1000 metres in 1:07:00 (67 seconds) on 10 November 2007, a world record at the time.
• The number of the laps of the German Grand Prix since 2002 if the race was held at Hockenheimring.