13508821679 has 4 divisors (see below), whose sum is σ = 14096161776. Its totient is φ = 12921481584.

The previous prime is 13508821663. The next prime is 13508821681. The reversal of 13508821679 is 97612880531.

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 13508821679 - 2⁴ = 13508821663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13508821379) 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, 293670014 + ... + 293670059.

It is an arithmetic number, because the mean of its divisors is an integer number (3524040444).

Almost surely, 2^13508821679 is an apocalyptic number.

13508821679 is a deficient number, since it is larger than the sum of its proper divisors (587340097).

13508821679 is an equidigital number, since it uses as much as digits as its factorization.

13508821679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587340096.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 13508821679 in words is "thirteen billion, five hundred eight million, eight hundred twenty-one thousand, six hundred seventy-nine".