13523993613 has 12 divisors (see below), whose sum is σ = 21037323580. Its totient is φ = 8322457536.

The previous prime is 13523993579. The next prime is 13523993621. The reversal of 13523993613 is 31639932531.

13523993613 is a `hidden beast` number, since 1 + 3 + 5 + 23 + 9 + 9 + 3 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5752160649 + 7771832964 = 75843^2 + 88158^2 .

It is not a de Polignac number, because 13523993613 - 2¹⁰ = 13523992589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13523993513) 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, 57794728 + ... + 57794961.

Almost surely, 2^13523993613 is an apocalyptic number.

13523993613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13523993613 is a deficient number, since it is larger than the sum of its proper divisors (7513329967).

13523993613 is a wasteful number, since it uses less digits than its factorization.

13523993613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115589708 (or 115589705 counting only the distinct ones).

The product of its digits is 393660, while the sum is 45.

The spelling of 13523993613 in words is "thirteen billion, five hundred twenty-three million, nine hundred ninety-three thousand, six hundred thirteen".