15500000556 has 18 divisors (see below), whose sum is σ = 39180557052. Its totient is φ = 5166666840.

The previous prime is 15500000543. The next prime is 15500000561. The reversal of 15500000556 is 65500000551.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215277750 + ... + 215277821.

It is an arithmetic number, because the mean of its divisors is an integer number (2176697614).

Almost surely, 2^15500000556 is an apocalyptic number.

It is an amenable number.

15500000556 is an abundant number, since it is smaller than the sum of its proper divisors (23680556496).

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

15500000556 is a wasteful number, since it uses less digits than its factorization.

15500000556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430555581 (or 430555576 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The spelling of 15500000556 in words is "fifteen billion, five hundred million, five hundred fifty-six", and thus it is an aban number.