256809760904 has 8 divisors (see below), whose sum is σ = 481518301710. Its totient is φ = 128404880448.

The previous prime is 256809760897. The next prime is 256809760919. The reversal of 256809760904 is 409067908652.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 228964164004 + 27845596900 = 478502^2 + 166870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 256809760904.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16050610049 + ... + 16050610064.

Almost surely, 2^256809760904 is an apocalyptic number.

It is an amenable number.

256809760904 is a deficient number, since it is larger than the sum of its proper divisors (224708540806).

256809760904 is a wasteful number, since it uses less digits than its factorization.

256809760904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32101220119 (or 32101220115 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 256809760904 in words is "two hundred fifty-six billion, eight hundred nine million, seven hundred sixty thousand, nine hundred four".