638580885682 has 16 divisors (see below), whose sum is σ = 999605733120. Its totient is φ = 305381414272.

The previous prime is 638580885671. The next prime is 638580885773. The reversal of 638580885682 is 286588085836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75658 + ... + 1132645.

It is an arithmetic number, because the mean of its divisors is an integer number (62475358320).

Almost surely, 2^638580885682 is an apocalyptic number.

638580885682 is a deficient number, since it is larger than the sum of its proper divisors (361024847438).

638580885682 is a wasteful number, since it uses less digits than its factorization.

638580885682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219817.

The product of its (nonzero) digits is 176947200, while the sum is 67.

The spelling of 638580885682 in words is "six hundred thirty-eight billion, five hundred eighty million, eight hundred eighty-five thousand, six hundred eighty-two".