256905864080 has 40 divisors (see below), whose sum is σ = 600433426944. Its totient is φ = 102224316800.

The previous prime is 256905864043. The next prime is 256905864091. The reversal of 256905864080 is 80468509652.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8391326 + ... + 8421885.

Almost surely, 2^256905864080 is an apocalyptic number.

256905864080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256905864080 is an abundant number, since it is smaller than the sum of its proper divisors (343527562864).

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

256905864080 is a wasteful number, since it uses less digits than its factorization.

256905864080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16813415 (or 16813409 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 256905864080 in words is "two hundred fifty-six billion, nine hundred five million, eight hundred sixty-four thousand, eighty".