639381337584 has 80 divisors (see below), whose sum is σ = 1802326429440. Its totient is φ = 193705300480.

The previous prime is 639381337577. The next prime is 639381337603. The reversal of 639381337584 is 485733183936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082997 + ... + 2370155.

It is an arithmetic number, because the mean of its divisors is an integer number (22529080368).

Almost surely, 2^639381337584 is an apocalyptic number.

It is an amenable number.

639381337584 is an abundant number, since it is smaller than the sum of its proper divisors (1162945091856).

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

639381337584 is a wasteful number, since it uses less digits than its factorization.

639381337584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291398 (or 291392 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 60.

The spelling of 639381337584 in words is "six hundred thirty-nine billion, three hundred eighty-one million, three hundred thirty-seven thousand, five hundred eighty-four".