56661515055 has 12 divisors (see below), whose sum is σ = 98213292840. Its totient is φ = 30219474672.

The previous prime is 56661515051. The next prime is 56661515087. The reversal of 56661515055 is 55051516665.

56661515055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56661515055 - 2² = 56661515051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1259144779 = 56661515055 / (5 + 6 + 6 + 6 + 1 + 5 + 1 + 5 + 0 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 56661515055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661515051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 629572345 + ... + 629572434.

It is an arithmetic number, because the mean of its divisors is an integer number (8184441070).

Almost surely, 2^56661515055 is an apocalyptic number.

56661515055 is a deficient number, since it is larger than the sum of its proper divisors (41551777785).

56661515055 is a wasteful number, since it uses less digits than its factorization.

56661515055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259144790 (or 1259144787 counting only the distinct ones).

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

The spelling of 56661515055 in words is "fifty-six billion, six hundred sixty-one million, five hundred fifteen thousand, fifty-five".