15551660556 has 24 divisors (see below), whose sum is σ = 40319120240. Its totient is φ = 5183886816.

The previous prime is 15551660549. The next prime is 15551660563. The reversal of 15551660556 is 65506615551.

15551660556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15551660549) and next prime (15551660563).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71998321 + ... + 71998536.

Almost surely, 2^15551660556 is an apocalyptic number.

It is an amenable number.

15551660556 is an abundant number, since it is smaller than the sum of its proper divisors (24767459684).

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

15551660556 is a wasteful number, since it uses less digits than its factorization.

15551660556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143996870 (or 143996862 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 15551660556 in words is "fifteen billion, five hundred fifty-one million, six hundred sixty thousand, five hundred fifty-six".