639356490680 has 16 divisors (see below), whose sum is σ = 1438552104120. Its totient is φ = 255742596256.

The previous prime is 639356490677. The next prime is 639356490697. The reversal of 639356490680 is 86094653936.

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, 7991956094 + ... + 7991956173.

Almost surely, 2^639356490680 is an apocalyptic number.

It is an amenable number.

639356490680 is an abundant number, since it is smaller than the sum of its proper divisors (799195613440).

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

639356490680 is a wasteful number, since it uses less digits than its factorization.

639356490680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15983912278 (or 15983912274 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 59.

The spelling of 639356490680 in words is "six hundred thirty-nine billion, three hundred fifty-six million, four hundred ninety thousand, six hundred eighty".