256691511724265 has 64 divisors (see below), whose sum is σ = 329604353971200. Its totient is φ = 191349171360000.

The previous prime is 256691511724259. The next prime is 256691511724279. The reversal of 256691511724265 is 562427115196652.

It is not a de Polignac number, because 256691511724265 - 2⁶ = 256691511724201 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256691511724198 and 256691511724207.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4569794630 + ... + 4569850800.

It is an arithmetic number, because the mean of its divisors is an integer number (5150068030800).

Almost surely, 2^{256691511724265} is an apocalyptic number.

It is an amenable number.

256691511724265 is a deficient number, since it is larger than the sum of its proper divisors (72912842246935).

256691511724265 is a wasteful number, since it uses less digits than its factorization.

256691511724265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58838.

The product of its digits is 54432000, while the sum is 62.

The spelling of 256691511724265 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-five".