13581320579 has 4 divisors (see below), whose sum is σ = 13586895984. Its totient is φ = 13575745176.

The previous prime is 13581320573. The next prime is 13581320617. The reversal of 13581320579 is 97502318531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13581320579 - 2⁴ = 13581320563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13581320573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2784047 + ... + 2788920.

It is an arithmetic number, because the mean of its divisors is an integer number (3396723996).

Almost surely, 2^13581320579 is an apocalyptic number.

13581320579 is a deficient number, since it is larger than the sum of its proper divisors (5575405).

13581320579 is an equidigital number, since it uses as much as digits as its factorization.

13581320579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5575404.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 13581320579 in words is "thirteen billion, five hundred eighty-one million, three hundred twenty thousand, five hundred seventy-nine".