13631561615 has 12 divisors (see below), whose sum is σ = 19028547576. Its totient is φ = 9347356368.

The previous prime is 13631561591. The next prime is 13631561641. The reversal of 13631561615 is 51616513631.

13631561615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13631561615 - 2²⁸ = 13363126159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27819269 + ... + 27819758.

It is an arithmetic number, because the mean of its divisors is an integer number (1585712298).

Almost surely, 2^13631561615 is an apocalyptic number.

13631561615 is a deficient number, since it is larger than the sum of its proper divisors (5396985961).

13631561615 is an equidigital number, since it uses as much as digits as its factorization.

13631561615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55639046 (or 55639039 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The spelling of 13631561615 in words is "thirteen billion, six hundred thirty-one million, five hundred sixty-one thousand, six hundred fifteen".