256808338792 has 16 divisors (see below), whose sum is σ = 483434028000. Its totient is φ = 127892598000.

The previous prime is 256808338789. The next prime is 256808338819. The reversal of 256808338792 is 297833808652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256808338792.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63944292 + ... + 63948307.

It is an arithmetic number, because the mean of its divisors is an integer number (30214626750).

Almost surely, 2^256808338792 is an apocalyptic number.

It is an amenable number.

256808338792 is a deficient number, since it is larger than the sum of its proper divisors (226625689208).

256808338792 is a wasteful number, since it uses less digits than its factorization.

256808338792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127892856 (or 127892852 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 256808338792 in words is "two hundred fifty-six billion, eight hundred eight million, three hundred thirty-eight thousand, seven hundred ninety-two".