138691035256 has 16 divisors (see below), whose sum is σ = 260206138440. Its totient is φ = 69302731680.

The previous prime is 138691035187. The next prime is 138691035289. The reversal of 138691035256 is 652530196831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5334466 + ... + 5360401.

Almost surely, 2^138691035256 is an apocalyptic number.

It is an amenable number.

138691035256 is a deficient number, since it is larger than the sum of its proper divisors (121515103184).

138691035256 is a wasteful number, since it uses less digits than its factorization.

138691035256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10696494 (or 10696490 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 138691035256 in words is "one hundred thirty-eight billion, six hundred ninety-one million, thirty-five thousand, two hundred fifty-six".