13261904765 has 16 divisors (see below), whose sum is σ = 17583049728. Its totient is φ = 9551283456.

The previous prime is 13261904737. The next prime is 13261904837. The reversal of 13261904765 is 56740916231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13261904765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3389837 + ... + 3393746.

It is an arithmetic number, because the mean of its divisors is an integer number (1098940608).

Almost surely, 2^13261904765 is an apocalyptic number.

It is an amenable number.

13261904765 is a deficient number, since it is larger than the sum of its proper divisors (4321144963).

13261904765 is a wasteful number, since it uses less digits than its factorization.

13261904765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783628.

The product of its (nonzero) digits is 272160, while the sum is 44.

It can be divided in two parts, 1326 and 1904765, that added together give a palindrome (1906091).

The spelling of 13261904765 in words is "thirteen billion, two hundred sixty-one million, nine hundred four thousand, seven hundred sixty-five".