639094290636 has 12 divisors (see below), whose sum is σ = 1491220011512. Its totient is φ = 213031430208.

The previous prime is 639094290599. The next prime is 639094290641. The reversal of 639094290636 is 636092490936.

It is a tau number, because it is divible by the number of its divisors (12).

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, 26628928765 + ... + 26628928788.

Almost surely, 2^639094290636 is an apocalyptic number.

It is an amenable number.

639094290636 is an abundant number, since it is smaller than the sum of its proper divisors (852125720876).

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

639094290636 is a wasteful number, since it uses less digits than its factorization.

639094290636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53257857560 (or 53257857558 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 57.

The spelling of 639094290636 in words is "six hundred thirty-nine billion, ninety-four million, two hundred ninety thousand, six hundred thirty-six".