636806662768 has 20 divisors (see below), whose sum is σ = 1254039352168. Its totient is φ = 313183604160.

The previous prime is 636806662759. The next prime is 636806662771. The reversal of 636806662768 is 867266608636.

It is a congruent number.

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, 326231946 + ... + 326233897.

Almost surely, 2^636806662768 is an apocalyptic number.

It is an amenable number.

636806662768 is a deficient number, since it is larger than the sum of its proper divisors (617232689400).

636806662768 is a wasteful number, since it uses less digits than its factorization.

636806662768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652465912 (or 652465906 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 64.

The spelling of 636806662768 in words is "six hundred thirty-six billion, eight hundred six million, six hundred sixty-two thousand, seven hundred sixty-eight".