256823034865 has 32 divisors (see below), whose sum is σ = 344095776000. Its totient is φ = 182872516608.

The previous prime is 256823034863. The next prime is 256823034893. The reversal of 256823034865 is 568430328652.

It is a cyclic number.

It is not a de Polignac number, because 256823034865 - 2¹ = 256823034863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256823034863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 779196 + ... + 1058674.

It is an arithmetic number, because the mean of its divisors is an integer number (10752993000).

Almost surely, 2^256823034865 is an apocalyptic number.

It is an amenable number.

256823034865 is a deficient number, since it is larger than the sum of its proper divisors (87272741135).

256823034865 is a wasteful number, since it uses less digits than its factorization.

256823034865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280089.

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 256823034865 in words is "two hundred fifty-six billion, eight hundred twenty-three million, thirty-four thousand, eight hundred sixty-five".