662

662 = 2 x 331.

662 is a divisor of 31³ - 1.

662 is the index of the smallest triangular number that contains the digits 1, 2, 3, 4, and 5 (219,453).

662 is 220112 in base 3 and 22112 in base 4. It is 10122 in base 5 and 3022 in base 6.

662 is the sum of 12 consecutive primes (A127339): 662 = 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73 + 79.

Source: What's Special About This Number?