138635965908 has 48 divisors (see below), whose sum is σ = 392101725120. Its totient is φ = 42010898400.

The previous prime is 138635965883. The next prime is 138635965961. The reversal of 138635965908 is 809569536831.

138635965908 is a `hidden beast` number, since 1 + 3 + 8 + 6 + 35 + 9 + 6 + 590 + 8 = 666.

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, 58347283 + ... + 58349658.

It is an arithmetic number, because the mean of its divisors is an integer number (8168785940).

Almost surely, 2^138635965908 is an apocalyptic number.

138635965908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138635965908 is an abundant number, since it is smaller than the sum of its proper divisors (253465759212).

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

138635965908 is a wasteful number, since it uses less digits than its factorization.

138635965908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116696965 (or 116696957 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 63.

The spelling of 138635965908 in words is "one hundred thirty-eight billion, six hundred thirty-five million, nine hundred sixty-five thousand, nine hundred eight".