13611538944 has 160 divisors (see below), whose sum is σ = 40613591040. Its totient is φ = 4500873216.

The previous prime is 13611538921. The next prime is 13611538949. The reversal of 13611538944 is 44983511631.

13611538944 is a `hidden beast` number, since 13 + 6 + 11 + 538 + 94 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 13611538944.

It is not an unprimeable number, because it can be changed into a prime (13611538949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751772 + ... + 1759524.

It is an arithmetic number, because the mean of its divisors is an integer number (253834944).

Almost surely, 2^13611538944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13611538944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20306795520).

13611538944 is an abundant number, since it is smaller than the sum of its proper divisors (27002052096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13611538944 is an equidigital number, since it uses as much as digits as its factorization.

13611538944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907 (or 7885 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 13611538944 in words is "thirteen billion, six hundred eleven million, five hundred thirty-eight thousand, nine hundred forty-four".