138863205904 has 20 divisors (see below), whose sum is σ = 269352877500. Its totient is φ = 69352785920.

The previous prime is 138863205889. The next prime is 138863205913. The reversal of 138863205904 is 409502368831.

It can be written as a sum of positive squares in 2 ways, for example, as 34133301504 + 104729904400 = 184752^2 + 323620^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4911529 + ... + 4939720.

It is an arithmetic number, because the mean of its divisors is an integer number (13467643875).

Almost surely, 2^138863205904 is an apocalyptic number.

It is an amenable number.

138863205904 is a deficient number, since it is larger than the sum of its proper divisors (130489671596).

138863205904 is an equidigital number, since it uses as much as digits as its factorization.

138863205904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852138 (or 9852132 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 138863205904 in words is "one hundred thirty-eight billion, eight hundred sixty-three million, two hundred five thousand, nine hundred four".