13138725691 has 72 divisors (see below), whose sum is σ = 17242928640. Its totient is φ = 9980923680.

The previous prime is 13138725679. The next prime is 13138725697. The reversal of 13138725691 is 19652783131.

It is a happy number.

It is not a de Polignac number, because 13138725691 - 2²⁹ = 12601854779 is a prime.

It is a super-2 number, since 2×13138725691² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138725697) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 103454470 + ... + 103454596.

It is an arithmetic number, because the mean of its divisors is an integer number (239485120).

Almost surely, 2^13138725691 is an apocalyptic number.

13138725691 is a deficient number, since it is larger than the sum of its proper divisors (4104202949).

13138725691 is an equidigital number, since it uses as much as digits as its factorization.

13138725691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 178 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The spelling of 13138725691 in words is "thirteen billion, one hundred thirty-eight million, seven hundred twenty-five thousand, six hundred ninety-one".