138537956132 has 24 divisors (see below), whose sum is σ = 246084826680. Its totient is φ = 68234969600.

The previous prime is 138537956111. The next prime is 138537956159. The reversal of 138537956132 is 231659735831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 53376709156 + 85161246976 = 231034^2 + 291824^2 .

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, 790757 + ... + 949932.

It is an arithmetic number, because the mean of its divisors is an integer number (10253534445).

Almost surely, 2^138537956132 is an apocalyptic number.

It is an amenable number.

138537956132 is a deficient number, since it is larger than the sum of its proper divisors (107546870548).

138537956132 is a wasteful number, since it uses less digits than its factorization.

138537956132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740991 (or 1740989 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 53.

The spelling of 138537956132 in words is "one hundred thirty-eight billion, five hundred thirty-seven million, nine hundred fifty-six thousand, one hundred thirty-two".