15561728285 has 16 divisors (see below), whose sum is σ = 19287869952. Its totient is φ = 12040660800.

The previous prime is 15561728261. The next prime is 15561728317. The reversal of 15561728285 is 58282716551.

It is not a de Polignac number, because 15561728285 - 2¹⁰ = 15561727261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241022 + ... + 298688.

It is an arithmetic number, because the mean of its divisors is an integer number (1205491872).

Almost surely, 2^15561728285 is an apocalyptic number.

It is an amenable number.

15561728285 is a deficient number, since it is larger than the sum of its proper divisors (3726141667).

15561728285 is a wasteful number, since it uses less digits than its factorization.

15561728285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59444.

The product of its digits is 1344000, while the sum is 50.

The spelling of 15561728285 in words is "fifteen billion, five hundred sixty-one million, seven hundred twenty-eight thousand, two hundred eighty-five".