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

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)
• a sexy prime with 61 and 73