138621890608 has 40 divisors (see below), whose sum is σ = 275910142208. Its totient is φ = 67420242432.

The previous prime is 138621890593. The next prime is 138621890611. The reversal of 138621890608 is 806098126831.

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, 2430385 + ... + 2486767.

Almost surely, 2^138621890608 is an apocalyptic number.

It is an amenable number.

138621890608 is a deficient number, since it is larger than the sum of its proper divisors (137288251600).

138621890608 is a wasteful number, since it uses less digits than its factorization.

138621890608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60581 (or 60575 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 138621890608 in words is "one hundred thirty-eight billion, six hundred twenty-one million, eight hundred ninety thousand, six hundred eight".