13263521265 has 12 divisors (see below), whose sum is σ = 22990103604. Its totient is φ = 7073877984.

The previous prime is 13263521231. The next prime is 13263521267. The reversal of 13263521265 is 56212536231.

13263521265 is a `hidden beast` number, since 1 + 3 + 2 + 635 + 2 + 12 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4983795216 + 8279726049 = 70596^2 + 90993^2 .

It is not a de Polignac number, because 13263521265 - 2²⁰ = 13262472689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13263521267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147372414 + ... + 147372503.

It is an arithmetic number, because the mean of its divisors is an integer number (1915841967).

Almost surely, 2^13263521265 is an apocalyptic number.

13263521265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13263521265 is a deficient number, since it is larger than the sum of its proper divisors (9726582339).

13263521265 is a wasteful number, since it uses less digits than its factorization.

13263521265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294744928 (or 294744925 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The spelling of 13263521265 in words is "thirteen billion, two hundred sixty-three million, five hundred twenty-one thousand, two hundred sixty-five".