138515845122 has 130 divisors (see below), whose sum is σ = 328974792963. Its totient is φ = 43741845828.

The previous prime is 138515845087. The next prime is 138515845129. The reversal of 138515845122 is 221548515831.

It is a happy number.

138515845122 is a `hidden beast` number, since 1 + 3 + 8 + 51 + 5 + 84 + 512 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 69257922561 + 69257922561 = 263169^2 + 263169^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=263169.

Its product of digits (384000) is a multiple of the sum of its prime divisors (24).

It is not an unprimeable number, because it can be changed into a prime (138515845129) by changing a digit.

It is a polite number, since it can be written in 64 ways as a sum of consecutive naturals, for example, 7290307629 + ... + 7290307647.

Almost surely, 2^138515845122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138515845122

138515845122 is an abundant number, since it is smaller than the sum of its proper divisors (190458947841).

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

138515845122 is an frugal number, since it uses more digits than its factorization.

138515845122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 24 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The spelling of 138515845122 in words is "one hundred thirty-eight billion, five hundred fifteen million, eight hundred forty-five thousand, one hundred twenty-two".