138561818118 has 16 divisors (see below), whose sum is σ = 277129151040. Its totient is φ = 46186353576.

The previous prime is 138561818063. The next prime is 138561818137. The reversal of 138561818118 is 811818165831.

It is a happy number.

It is a congruent number.

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, 143493 + ... + 545631.

It is an arithmetic number, because the mean of its divisors is an integer number (17320571940).

Almost surely, 2^138561818118 is an apocalyptic number.

138561818118 is an abundant number, since it is smaller than the sum of its proper divisors (138567332922).

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

138561818118 is a wasteful number, since it uses less digits than its factorization.

138561818118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459571.

The product of its digits is 368640, while the sum is 51.

The spelling of 138561818118 in words is "one hundred thirty-eight billion, five hundred sixty-one million, eight hundred eighteen thousand, one hundred eighteen".