638851630596 has 48 divisors (see below), whose sum is σ = 1605641146368. Its totient is φ = 197121117600.

The previous prime is 638851630583. The next prime is 638851630597. The reversal of 638851630596 is 695036158836.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (638851630597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37324990 + ... + 37342101.

It is an arithmetic number, because the mean of its divisors is an integer number (33450857216).

Almost surely, 2^638851630596 is an apocalyptic number.

It is an amenable number.

638851630596 is an abundant number, since it is smaller than the sum of its proper divisors (966789515772).

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

638851630596 is a wasteful number, since it uses less digits than its factorization.

638851630596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74667152 (or 74667150 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 60.

The spelling of 638851630596 in words is "six hundred thirty-eight billion, eight hundred fifty-one million, six hundred thirty thousand, five hundred ninety-six".