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.
Read more about this topic: 67 (number)
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