138515681375 has 16 divisors (see below), whose sum is σ = 175701474624. Its totient is φ = 108995940000.

The previous prime is 138515681357. The next prime is 138515681377. The reversal of 138515681375 is 573186515831.

It is not a de Polignac number, because 138515681375 - 2²² = 138511487071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138515681377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9075371 + ... + 9090620.

It is an arithmetic number, because the mean of its divisors is an integer number (10981342164).

Almost surely, 2^138515681375 is an apocalyptic number.

138515681375 is a deficient number, since it is larger than the sum of its proper divisors (37185793249).

138515681375 is an equidigital number, since it uses as much as digits as its factorization.

138515681375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18166067 (or 18166057 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 53.

The spelling of 138515681375 in words is "one hundred thirty-eight billion, five hundred fifteen million, six hundred eighty-one thousand, three hundred seventy-five".