256369844540 has 48 divisors (see below), whose sum is σ = 565504934400. Its totient is φ = 97439707200.

The previous prime is 256369844531. The next prime is 256369844629. The reversal of 256369844540 is 45448963652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775990 + ... + 1914909.

It is an arithmetic number, because the mean of its divisors is an integer number (11781352800).

Almost surely, 2^256369844540 is an apocalyptic number.

256369844540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256369844540 is an abundant number, since it is smaller than the sum of its proper divisors (309135089860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256369844540 is a wasteful number, since it uses less digits than its factorization.

256369844540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691082 (or 3691080 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 56.

The spelling of 256369844540 in words is "two hundred fifty-six billion, three hundred sixty-nine million, eight hundred forty-four thousand, five hundred forty".