12513263634 has 12 divisors (see below), whose sum is σ = 27112071246. Its totient is φ = 4171087872.

The previous prime is 12513263617. The next prime is 12513263639. The reversal of 12513263634 is 43636231521.

12513263634 is a `hidden beast` number, since 1 + 2 + 5 + 13 + 2 + 6 + 3 + 634 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6782016609 + 5731247025 = 82353^2 + 75705^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12513263639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 347590639 + ... + 347590674.

Almost surely, 2^12513263634 is an apocalyptic number.

12513263634 is an abundant number, since it is smaller than the sum of its proper divisors (14598807612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12513263634 is a wasteful number, since it uses less digits than its factorization.

12513263634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695181321 (or 695181318 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The spelling of 12513263634 in words is "twelve billion, five hundred thirteen million, two hundred sixty-three thousand, six hundred thirty-four".