638351583164 has 12 divisors (see below), whose sum is σ = 1117452485184. Its totient is φ = 319079444544.

The previous prime is 638351583131. The next prime is 638351583209. The reversal of 638351583164 is 461385153836.

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, 24071852 + ... + 24098355.

It is an arithmetic number, because the mean of its divisors is an integer number (93121040432).

Almost surely, 2^638351583164 is an apocalyptic number.

It is an amenable number.

638351583164 is a deficient number, since it is larger than the sum of its proper divisors (479100902020).

638351583164 is a wasteful number, since it uses less digits than its factorization.

638351583164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48173524 (or 48173522 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 53.

The spelling of 638351583164 in words is "six hundred thirty-eight billion, three hundred fifty-one million, five hundred eighty-three thousand, one hundred sixty-four".