639727336364 has 6 divisors (see below), whose sum is σ = 1119522838644. Its totient is φ = 319863668180.

The previous prime is 639727336321. The next prime is 639727336387. The reversal of 639727336364 is 463633727936.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79965917042 + ... + 79965917049.

It is an arithmetic number, because the mean of its divisors is an integer number (186587139774).

Almost surely, 2^639727336364 is an apocalyptic number.

It is an amenable number.

639727336364 is a deficient number, since it is larger than the sum of its proper divisors (479795502280).

639727336364 is a wasteful number, since it uses less digits than its factorization.

639727336364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159931834095 (or 159931834093 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 59.

The spelling of 639727336364 in words is "six hundred thirty-nine billion, seven hundred twenty-seven million, three hundred thirty-six thousand, three hundred sixty-four".