138278739522 has 64 divisors (see below), whose sum is σ = 344838933504. Its totient is φ = 35912389440.

The previous prime is 138278739497. The next prime is 138278739539. The reversal of 138278739522 is 225937872831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7347028 + ... + 7365824.

It is an arithmetic number, because the mean of its divisors is an integer number (5388108336).

Almost surely, 2^138278739522 is an apocalyptic number.

138278739522 is an abundant number, since it is smaller than the sum of its proper divisors (206560193982).

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

138278739522 is a wasteful number, since it uses less digits than its factorization.

138278739522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34743.

The product of its digits is 10160640, while the sum is 57.

The spelling of 138278739522 in words is "one hundred thirty-eight billion, two hundred seventy-eight million, seven hundred thirty-nine thousand, five hundred twenty-two".