138640899560 has 32 divisors (see below), whose sum is σ = 313280852040. Its totient is φ = 55218345984.

The previous prime is 138640899557. The next prime is 138640899583. The reversal of 138640899560 is 65998046831.

It can be written as a sum of positive squares in 4 ways, for example, as 87141859204 + 51499040356 = 295198^2 + 226934^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138640899560.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7428497 + ... + 7447136.

Almost surely, 2^138640899560 is an apocalyptic number.

138640899560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138640899560 is an abundant number, since it is smaller than the sum of its proper divisors (174639952480).

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

138640899560 is a wasteful number, since it uses less digits than its factorization.

138640899560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14875877 (or 14875873 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 138640899560 in words is "one hundred thirty-eight billion, six hundred forty million, eight hundred ninety-nine thousand, five hundred sixty".