138691716959 has 4 divisors (see below), whose sum is σ = 138867946104. Its totient is φ = 138515487816.

The previous prime is 138691716937. The next prime is 138691716991. The reversal of 138691716959 is 959617196831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959617196831 = 199 ⋅4822196969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138691716959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138691716895 and 138691716904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138691716259) 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, 88113392 + ... + 88114965.

It is an arithmetic number, because the mean of its divisors is an integer number (34716986526).

Almost surely, 2^138691716959 is an apocalyptic number.

138691716959 is a deficient number, since it is larger than the sum of its proper divisors (176229145).

138691716959 is an equidigital number, since it uses as much as digits as its factorization.

138691716959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176229144.

The product of its digits is 22044960, while the sum is 65.

The spelling of 138691716959 in words is "one hundred thirty-eight billion, six hundred ninety-one million, seven hundred sixteen thousand, nine hundred fifty-nine".