15561883264 has 16 divisors (see below), whose sum is σ = 31002189570. Its totient is φ = 7780941568.

The previous prime is 15561883241. The next prime is 15561883273. The reversal of 15561883264 is 46238816551.

It can be written as a sum of positive squares in only one way, i.e., 8909849664 + 6652033600 = 94392^2 + 81560^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60788479 + ... + 60788734.

Almost surely, 2^15561883264 is an apocalyptic number.

It is an amenable number.

15561883264 is a deficient number, since it is larger than the sum of its proper divisors (15440306306).

15561883264 is an equidigital number, since it uses as much as digits as its factorization.

15561883264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121577227 (or 121577215 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

The spelling of 15561883264 in words is "fifteen billion, five hundred sixty-one million, eight hundred eighty-three thousand, two hundred sixty-four".