138700661517 has 12 divisors (see below), whose sum is σ = 218558618304. Its totient is φ = 84061006920.

The previous prime is 138700661507. The next prime is 138700661521. The reversal of 138700661517 is 715166007831.

138700661517 is a `hidden beast` number, since 1 + 3 + 8 + 70 + 0 + 6 + 61 + 517 = 666.

It is not a de Polignac number, because 138700661517 - 2⁸ = 138700661261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138700661507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 700508293 + ... + 700508490.

It is an arithmetic number, because the mean of its divisors is an integer number (18213218192).

Almost surely, 2^138700661517 is an apocalyptic number.

It is an amenable number.

138700661517 is a deficient number, since it is larger than the sum of its proper divisors (79857956787).

138700661517 is a wasteful number, since it uses less digits than its factorization.

138700661517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401016800 (or 1401016797 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 138700661517 in words is "one hundred thirty-eight billion, seven hundred million, six hundred sixty-one thousand, five hundred seventeen".