13261621263 has 16 divisors (see below), whose sum is σ = 19301711616. Its totient is φ = 8032312640.

The previous prime is 13261621237. The next prime is 13261621319. The reversal of 13261621263 is 36212616231.

It is not a de Polignac number, because 13261621263 - 2⁶ = 13261621199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261621663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72006 + ... + 178067.

It is an arithmetic number, because the mean of its divisors is an integer number (1206356976).

Almost surely, 2^13261621263 is an apocalyptic number.

13261621263 is a deficient number, since it is larger than the sum of its proper divisors (6040090353).

13261621263 is a wasteful number, since it uses less digits than its factorization.

13261621263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251694.

The product of its digits is 15552, while the sum is 33.

The spelling of 13261621263 in words is "thirteen billion, two hundred sixty-one million, six hundred twenty-one thousand, two hundred sixty-three".