13257612261 has 12 divisors (see below), whose sum is σ = 19161462892. Its totient is φ = 8833064256.

The previous prime is 13257612223. The next prime is 13257612289. The reversal of 13257612261 is 16221675231.

13257612261 is a `hidden beast` number, since 1 + 3 + 2 + 576 + 1 + 22 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8745803361 + 4511808900 = 93519^2 + 67170^2 .

It is not a de Polignac number, because 13257612261 - 2⁹ = 13257611749 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 (13257602261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429586 + ... + 459411.

Almost surely, 2^13257612261 is an apocalyptic number.

It is an amenable number.

13257612261 is a deficient number, since it is larger than the sum of its proper divisors (5903850631).

13257612261 is a wasteful number, since it uses less digits than its factorization.

13257612261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890660 (or 890657 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 13257612261 in words is "thirteen billion, two hundred fifty-seven million, six hundred twelve thousand, two hundred sixty-one".