138556318518 has 96 divisors (see below), whose sum is σ = 308980998144. Its totient is φ = 44859298176.

The previous prime is 138556318489. The next prime is 138556318529. The reversal of 138556318518 is 815813655831.

138556318518 is a `hidden beast` number, since 1 + 3 + 8 + 55 + 63 + 18 + 518 = 666.

It is a super-2 number, since 2×138556318518² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25575346 + ... + 25580762.

It is an arithmetic number, because the mean of its divisors is an integer number (3218552064).

Almost surely, 2^138556318518 is an apocalyptic number.

138556318518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138556318518 is an abundant number, since it is smaller than the sum of its proper divisors (170424679626).

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

138556318518 is a wasteful number, since it uses less digits than its factorization.

138556318518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5786 (or 5783 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 54.

The spelling of 138556318518 in words is "one hundred thirty-eight billion, five hundred fifty-six million, three hundred eighteen thousand, five hundred eighteen".