138837015815 has 4 divisors (see below), whose sum is σ = 166604418984. Its totient is φ = 111069612648.

The previous prime is 138837015809. The next prime is 138837015829. The reversal of 138837015815 is 518510738831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138837015815 - 2⁴ = 138837015799 is a prime.

It is a super-2 number, since 2×138837015815² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13883701577 + ... + 13883701586.

It is an arithmetic number, because the mean of its divisors is an integer number (41651104746).

Almost surely, 2^138837015815 is an apocalyptic number.

138837015815 is a deficient number, since it is larger than the sum of its proper divisors (27767403169).

138837015815 is an equidigital number, since it uses as much as digits as its factorization.

138837015815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27767403168.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 138837015815 in words is "one hundred thirty-eight billion, eight hundred thirty-seven million, fifteen thousand, eight hundred fifteen".