138779139122 has 54 divisors (see below), whose sum is σ = 235907923671. Its totient is φ = 61197502080.

The previous prime is 138779139067. The next prime is 138779139131. The reversal of 138779139122 is 221931977831.

It can be written as a sum of positive squares in 5 ways, for example, as 239599441 + 138539539681 = 15479^2 + 372209^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=263419.

It is a Duffinian number.

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 26 ways as a sum of consecutive naturals, for example, 157524122 + ... + 157525002.

Almost surely, 2^138779139122 is an apocalyptic number.

138779139122 is a deficient number, since it is larger than the sum of its proper divisors (97128784549).

138779139122 is an frugal number, since it uses more digits than its factorization.

138779139122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836 (or 919 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 53.

The spelling of 138779139122 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, one hundred thirty-nine thousand, one hundred twenty-two".