256990075646 has 16 divisors (see below), whose sum is σ = 392052988080. Its totient is φ = 126306126720.

The previous prime is 256990075633. The next prime is 256990075679. The reversal of 256990075646 is 646570099652.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1355480 + ... + 1533396.

It is an arithmetic number, because the mean of its divisors is an integer number (24503311755).

Almost surely, 2^256990075646 is an apocalyptic number.

256990075646 is a deficient number, since it is larger than the sum of its proper divisors (135062912434).

256990075646 is a wasteful number, since it uses less digits than its factorization.

256990075646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190219.

The product of its (nonzero) digits is 24494400, while the sum is 59.

The spelling of 256990075646 in words is "two hundred fifty-six billion, nine hundred ninety million, seventy-five thousand, six hundred forty-six".