256691511724264 has 32 divisors (see below), whose sum is σ = 496900388240640. Its totient is φ = 124186043318400.

The previous prime is 256691511724259. The next prime is 256691511724279. The reversal of 256691511724264 is 462427115196652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79781254 + ... + 82936309.

It is an arithmetic number, because the mean of its divisors is an integer number (15528137132520).

Almost surely, 2^{256691511724264} is an apocalyptic number.

It is an amenable number.

256691511724264 is a deficient number, since it is larger than the sum of its proper divisors (240208876516376).

256691511724264 is a wasteful number, since it uses less digits than its factorization.

256691511724264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162723961 (or 162723957 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 61.

The spelling of 256691511724264 in words is "two hundred fifty-six trillion, six hundred ninety-one billion, five hundred eleven million, seven hundred twenty-four thousand, two hundred sixty-four".