138638168812 has 24 divisors (see below), whose sum is σ = 285032320272. Its totient is φ = 58169860800.

The previous prime is 138638168731. The next prime is 138638168821. The reversal of 138638168812 is 218861836831.

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, 121186639 + ... + 121187782.

It is an arithmetic number, because the mean of its divisors is an integer number (11876346678).

Almost surely, 2^138638168812 is an apocalyptic number.

It is an amenable number.

138638168812 is an abundant number, since it is smaller than the sum of its proper divisors (146394151460).

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

138638168812 is a wasteful number, since it uses less digits than its factorization.

138638168812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242374449 (or 242374447 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 55.

The spelling of 138638168812 in words is "one hundred thirty-eight billion, six hundred thirty-eight million, one hundred sixty-eight thousand, eight hundred twelve".