638978626622 has 16 divisors (see below), whose sum is σ = 1130727155712. Its totient is φ = 265014176760.

The previous prime is 638978626619. The next prime is 638978626631. The reversal of 638978626622 is 226626879836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736150058 + ... + 736150925.

It is an arithmetic number, because the mean of its divisors is an integer number (70670447232).

Almost surely, 2^638978626622 is an apocalyptic number.

638978626622 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

638978626622 is a deficient number, since it is larger than the sum of its proper divisors (491748529090).

638978626622 is a wasteful number, since it uses less digits than its factorization.

638978626622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472301023.

The product of its digits is 125411328, while the sum is 65.

The spelling of 638978626622 in words is "six hundred thirty-eight billion, nine hundred seventy-eight million, six hundred twenty-six thousand, six hundred twenty-two".