639922107602 has 6 divisors (see below), whose sum is σ = 959884858359. Its totient is φ = 319960488150.

The previous prime is 639922107581. The next prime is 639922107661. The reversal of 639922107602 is 206701229936.

It can be written as a sum of positive squares in only one way, i.e., 319961053801 + 319961053801 = 565651^2 + 565651^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=565651.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 848477 + ... + 1414127.

Almost surely, 2^639922107602 is an apocalyptic number.

639922107602 is a deficient number, since it is larger than the sum of its proper divisors (319962750757).

639922107602 is an frugal number, since it uses more digits than its factorization.

639922107602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131304 (or 565653 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 639922107602 in words is "six hundred thirty-nine billion, nine hundred twenty-two million, one hundred seven thousand, six hundred two".