138677720417 has 4 divisors (see below), whose sum is σ = 138683721876. Its totient is φ = 138671718960.

The previous prime is 138677720399. The next prime is 138677720483. The reversal of 138677720417 is 714027776831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7123528801 + 131554191616 = 84401^2 + 362704^2 .

It is a cyclic number.

It is not a de Polignac number, because 138677720417 - 2²⁸ = 138409284961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138677720497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965934 + ... + 3012327.

It is an arithmetic number, because the mean of its divisors is an integer number (34670930469).

Almost surely, 2^138677720417 is an apocalyptic number.

It is an amenable number.

138677720417 is a deficient number, since it is larger than the sum of its proper divisors (6001459).

138677720417 is an equidigital number, since it uses as much as digits as its factorization.

138677720417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001458.

The product of its (nonzero) digits is 2765952, while the sum is 53.

The spelling of 138677720417 in words is "one hundred thirty-eight billion, six hundred seventy-seven million, seven hundred twenty thousand, four hundred seventeen".