15561544250 has 64 divisors (see below), whose sum is σ = 33317077248. Its totient is φ = 5331499200.

The previous prime is 15561544237. The next prime is 15561544291. The reversal of 15561544250 is 5244516551.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3450497 + ... + 3455003.

It is an arithmetic number, because the mean of its divisors is an integer number (520579332).

Almost surely, 2^15561544250 is an apocalyptic number.

15561544250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15561544250 is an abundant number, since it is smaller than the sum of its proper divisors (17755532998).

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

15561544250 is a wasteful number, since it uses less digits than its factorization.

15561544250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504 (or 6494 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 15561544250 in words is "fifteen billion, five hundred sixty-one million, five hundred forty-four thousand, two hundred fifty".