138696206868 has 72 divisors (see below), whose sum is σ = 372837727080. Its totient is φ = 43322480640.

The previous prime is 138696206843. The next prime is 138696206881. The reversal of 138696206868 is 868602696831.

It can be written as a sum of positive squares in 4 ways, for example, as 100769423364 + 37926783504 = 317442^2 + 194748^2 .

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 354673 + ... + 634968.

It is an arithmetic number, because the mean of its divisors is an integer number (5178301765).

Almost surely, 2^138696206868 is an apocalyptic number.

138696206868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138696206868 is an abundant number, since it is smaller than the sum of its proper divisors (234141520212).

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

138696206868 is a wasteful number, since it uses less digits than its factorization.

138696206868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989897 (or 989892 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 138696206868 in words is "one hundred thirty-eight billion, six hundred ninety-six million, two hundred six thousand, eight hundred sixty-eight".