638998801596 has 18 divisors (see below), whose sum is σ = 1615246970792. Its totient is φ = 212999600520.

The previous prime is 638998801561. The next prime is 638998801603. The reversal of 638998801596 is 695108899836.

638998801596 is a `hidden beast` number, since 6 + 389 + 98 + 8 + 0 + 159 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×638998801596² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8874983320 + ... + 8874983391.

Almost surely, 2^638998801596 is an apocalyptic number.

It is an amenable number.

638998801596 is an abundant number, since it is smaller than the sum of its proper divisors (976248169196).

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

638998801596 is a wasteful number, since it uses less digits than its factorization.

638998801596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17749966721 (or 17749966716 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 72.

The spelling of 638998801596 in words is "six hundred thirty-eight billion, nine hundred ninety-eight million, eight hundred one thousand, five hundred ninety-six".