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67 (number)
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.
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