256723837556 has 48 divisors (see below), whose sum is σ = 488106393600. Its totient is φ = 117760519008.

The previous prime is 256723837549. The next prime is 256723837583. The reversal of 256723837556 is 655738327652.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 256723837495 and 256723837504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126836 + ... + 727691.

It is an arithmetic number, because the mean of its divisors is an integer number (10168883200).

Almost surely, 2^256723837556 is an apocalyptic number.

It is an amenable number.

256723837556 is a deficient number, since it is larger than the sum of its proper divisors (231382556044).

256723837556 is a wasteful number, since it uses less digits than its factorization.

256723837556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854676 (or 854674 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 59.

The spelling of 256723837556 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, five hundred fifty-six".