13115968538 has 8 divisors (see below), whose sum is σ = 19674733140. Its totient is φ = 6557724160.

The previous prime is 13115968447. The next prime is 13115968543. The reversal of 13115968538 is 83586951131.

It can be written as a sum of positive squares in 2 ways, for example, as 13090334569 + 25633969 = 114413^2 + 5063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59333 + ... + 172488.

Almost surely, 2^13115968538 is an apocalyptic number.

13115968538 is a deficient number, since it is larger than the sum of its proper divisors (6558764602).

13115968538 is a wasteful number, since it uses less digits than its factorization.

13115968538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260112.

The product of its digits is 777600, while the sum is 50.

The spelling of 13115968538 in words is "thirteen billion, one hundred fifteen million, nine hundred sixty-eight thousand, five hundred thirty-eight".