138511366020 has 72 divisors (see below), whose sum is σ = 421149357720. Its totient is φ = 36848609280.

The previous prime is 138511366003. The next prime is 138511366031. The reversal of 138511366020 is 20663115831.

138511366020 is a `hidden beast` number, since 1 + 3 + 8 + 5 + 11 + 36 + 602 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 898560576 + 137612805444 = 29976^2 + 370962^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 838125 + ... + 989684.

It is an arithmetic number, because the mean of its divisors is an integer number (5849296635).

Almost surely, 2^138511366020 is an apocalyptic number.

138511366020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138511366020 is an abundant number, since it is smaller than the sum of its proper divisors (282637991700).

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

138511366020 is a wasteful number, since it uses less digits than its factorization.

138511366020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828245 (or 1828240 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 138511366020 in words is "one hundred thirty-eight billion, five hundred eleven million, three hundred sixty-six thousand, twenty".