56551551660 has 36 divisors (see below), whose sum is σ = 171539707248. Its totient is φ = 15080413728.

The previous prime is 56551551659. The next prime is 56551551697. The reversal of 56551551660 is 6615515565.

56551551660 is a `hidden beast` number, since 5 + 65 + 5 + 15 + 516 + 60 = 666.

56551551660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157087464 + ... + 157087823.

It is an arithmetic number, because the mean of its divisors is an integer number (4764991868).

Almost surely, 2^56551551660 is an apocalyptic number.

It is an amenable number.

56551551660 is an abundant number, since it is smaller than the sum of its proper divisors (114988155588).

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

56551551660 is a wasteful number, since it uses less digits than its factorization.

56551551660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314175302 (or 314175297 counting only the distinct ones).

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

The spelling of 56551551660 in words is "fifty-six billion, five hundred fifty-one million, five hundred fifty-one thousand, six hundred sixty".