256690217352 has 64 divisors (see below), whose sum is σ = 662501030400. Its totient is φ = 82793963520.

The previous prime is 256690217339. The next prime is 256690217363. The reversal of 256690217352 is 253712096652.

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, 10177974 + ... + 10203162.

It is an arithmetic number, because the mean of its divisors is an integer number (10351578600).

Almost surely, 2^256690217352 is an apocalyptic number.

It is an amenable number.

256690217352 is an abundant number, since it is smaller than the sum of its proper divisors (405810813048).

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

256690217352 is a wasteful number, since it uses less digits than its factorization.

256690217352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38926 (or 38922 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 256690217352 in words is "two hundred fifty-six billion, six hundred ninety million, two hundred seventeen thousand, three hundred fifty-two".