138475977687 has 12 divisors (see below), whose sum is σ = 200030181624. Its totient is φ = 92313014640.

The previous prime is 138475977643. The next prime is 138475977691. The reversal of 138475977687 is 786779574831.

138475977687 is a `hidden beast` number, since 1 + 3 + 8 + 475 + 9 + 7 + 76 + 87 = 666.

It is not a de Polignac number, because 138475977687 - 2⁶ = 138475977623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138475977697) 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, 148389 + ... + 546782.

It is an arithmetic number, because the mean of its divisors is an integer number (16669181802).

Almost surely, 2^138475977687 is an apocalyptic number.

138475977687 is a deficient number, since it is larger than the sum of its proper divisors (61554203937).

138475977687 is a wasteful number, since it uses less digits than its factorization.

138475977687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717310 (or 717307 counting only the distinct ones).

The product of its digits is 497871360, while the sum is 72.

The spelling of 138475977687 in words is "one hundred thirty-eight billion, four hundred seventy-five million, nine hundred seventy-seven thousand, six hundred eighty-seven".