256631104565642 has 16 divisors (see below), whose sum is σ = 398252933033760. Its totient is φ = 123880843633008.

The previous prime is 256631104565623. The next prime is 256631104565677. The reversal of 256631104565642 is 246565401136652.

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, 178464008 + ... + 179896259.

It is an arithmetic number, because the mean of its divisors is an integer number (24890808314610).

Almost surely, 2^{256631104565642} is an apocalyptic number.

256631104565642 is a deficient number, since it is larger than the sum of its proper divisors (141621828468118).

256631104565642 is a wasteful number, since it uses less digits than its factorization.

256631104565642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358372645.

The product of its (nonzero) digits is 31104000, while the sum is 56.

The spelling of 256631104565642 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, one hundred four million, five hundred sixty-five thousand, six hundred forty-two".