639595904871 has 16 divisors (see below), whose sum is σ = 1063224361728. Its totient is φ = 332257612800.

The previous prime is 639595904813. The next prime is 639595904903. The reversal of 639595904871 is 178409595936.

It is not a de Polignac number, because 639595904871 - 2¹⁰ = 639595903847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639595904371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1384406490 + ... + 1384406951.

It is an arithmetic number, because the mean of its divisors is an integer number (66451522608).

Almost surely, 2^639595904871 is an apocalyptic number.

639595904871 is a deficient number, since it is larger than the sum of its proper divisors (423628456857).

639595904871 is a wasteful number, since it uses less digits than its factorization.

639595904871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768813462.

The product of its (nonzero) digits is 73483200, while the sum is 66.

The spelling of 639595904871 in words is "six hundred thirty-nine billion, five hundred ninety-five million, nine hundred four thousand, eight hundred seventy-one".