15561840116 has 24 divisors (see below), whose sum is σ = 28279623624. Its totient is φ = 7487147520.

The previous prime is 15561840097. The next prime is 15561840127. The reversal of 15561840116 is 61104816551.

It can be written as a sum of positive squares in 4 ways, for example, as 1064716900 + 14497123216 = 32630^2 + 120404^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15561840116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637955 + ... + 661898.

It is an arithmetic number, because the mean of its divisors is an integer number (1178317651).

Almost surely, 2^15561840116 is an apocalyptic number.

It is an amenable number.

15561840116 is a deficient number, since it is larger than the sum of its proper divisors (12717783508).

15561840116 is a wasteful number, since it uses less digits than its factorization.

15561840116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299971 (or 1299969 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 15561840116 in words is "fifteen billion, five hundred sixty-one million, eight hundred forty thousand, one hundred sixteen".