138655808138 has 16 divisors (see below), whose sum is σ = 213749292744. Its totient is φ = 67408577280.

The previous prime is 138655808129. The next prime is 138655808141. The reversal of 138655808138 is 831808556831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112066266169 + 26589541969 = 334763^2 + 163063^2 .

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, 522995 + ... + 742182.

Almost surely, 2^138655808138 is an apocalyptic number.

138655808138 is a deficient number, since it is larger than the sum of its proper divisors (75093484606).

138655808138 is a wasteful number, since it uses less digits than its factorization.

138655808138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266697.

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 138655808138 in words is "one hundred thirty-eight billion, six hundred fifty-five million, eight hundred eight thousand, one hundred thirty-eight".