15545221056 has 112 divisors (see below), whose sum is σ = 48388402080. Its totient is φ = 4876922880.

The previous prime is 15545221031. The next prime is 15545221061. The reversal of 15545221056 is 65012254551.

15545221056 is a `hidden beast` number, since 1 + 5 + 545 + 2 + 2 + 105 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15545221056.

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, 235215 + ... + 293966.

Almost surely, 2^15545221056 is an apocalyptic number.

15545221056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15545221056 is an abundant number, since it is smaller than the sum of its proper divisors (32843181024).

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

15545221056 is a wasteful number, since it uses less digits than its factorization.

15545221056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529219 (or 529203 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 15545221056 in words is "fifteen billion, five hundred forty-five million, two hundred twenty-one thousand, fifty-six".