639113680026 has 40 divisors (see below), whose sum is σ = 1436752954560. Its totient is φ = 212343942312.

The previous prime is 639113680021. The next prime is 639113680039. The reversal of 639113680026 is 620086311936.

639113680026 is a `hidden beast` number, since 639 + 1 + 1 + 3 + 6 + 8 + 0 + 0 + 2 + 6 = 666.

It is a super-2 number, since 2×639113680026² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639113680021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6375586 + ... + 6475053.

It is an arithmetic number, because the mean of its divisors is an integer number (35918823864).

Almost surely, 2^639113680026 is an apocalyptic number.

639113680026 is an abundant number, since it is smaller than the sum of its proper divisors (797639274534).

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

639113680026 is a wasteful number, since it uses less digits than its factorization.

639113680026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850960 (or 12850951 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 639113680026 in words is "six hundred thirty-nine billion, one hundred thirteen million, six hundred eighty thousand, twenty-six".