13513315155521 has 4 divisors (see below), whose sum is σ = 13878539889492. Its totient is φ = 13148090421552.

The previous prime is 13513315155469. The next prime is 13513315155533. The reversal of 13513315155521 is 12555151331531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10809628840000 + 2703686315521 = 3287800^2 + 1644289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13513315155521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13513315158521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182612366930 + ... + 182612367003.

It is an arithmetic number, because the mean of its divisors is an integer number (3469634972373).

Almost surely, 2^{13513315155521} is an apocalyptic number.

It is an amenable number.

13513315155521 is a deficient number, since it is larger than the sum of its proper divisors (365224733971).

13513315155521 is an equidigital number, since it uses as much as digits as its factorization.

13513315155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365224733970.

The product of its digits is 168750, while the sum is 41.

The spelling of 13513315155521 in words is "thirteen trillion, five hundred thirteen billion, three hundred fifteen million, one hundred fifty-five thousand, five hundred twenty-one".