641613640256 has 28 divisors (see below), whose sum is σ = 1300291479168. Its totient is φ = 313981141632.

The previous prime is 641613640247. The next prime is 641613640333. The reversal of 641613640256 is 652046316146.

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, 106648196 + ... + 106654211.

Almost surely, 2^641613640256 is an apocalyptic number.

It is an amenable number.

641613640256 is an abundant number, since it is smaller than the sum of its proper divisors (658677838912).

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

641613640256 is a wasteful number, since it uses less digits than its factorization.

641613640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213302466 (or 213302456 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 641613640256 in words is "six hundred forty-one billion, six hundred thirteen million, six hundred forty thousand, two hundred fifty-six".