638787659596 has 24 divisors (see below), whose sum is σ = 1131158945840. Its totient is φ = 315615102912.

The previous prime is 638787659507. The next prime is 638787659623. The reversal of 638787659596 is 695956787836.

638787659596 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1801326 + ... + 2126581.

Almost surely, 2^638787659596 is an apocalyptic number.

It is an amenable number.

638787659596 is a deficient number, since it is larger than the sum of its proper divisors (492371286244).

638787659596 is a wasteful number, since it uses less digits than its factorization.

638787659596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928393 (or 3928391 counting only the distinct ones).

The product of its digits is 4115059200, while the sum is 79.

The spelling of 638787659596 in words is "six hundred thirty-eight billion, seven hundred eighty-seven million, six hundred fifty-nine thousand, five hundred ninety-six".