56661611155 has 16 divisors (see below), whose sum is σ = 68704352640. Its totient is φ = 44856726912.

The previous prime is 56661611147. The next prime is 56661611161. The reversal of 56661611155 is 55111616665.

It is a cyclic number.

It is not a de Polignac number, because 56661611155 - 2³ = 56661611147 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 369142 + ... + 499588.

It is an arithmetic number, because the mean of its divisors is an integer number (4294022040).

Almost surely, 2^56661611155 is an apocalyptic number.

56661611155 is a deficient number, since it is larger than the sum of its proper divisors (12042741485).

56661611155 is a wasteful number, since it uses less digits than its factorization.

56661611155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131358.

The product of its digits is 162000, while the sum is 43.

The spelling of 56661611155 in words is "fifty-six billion, six hundred sixty-one million, six hundred eleven thousand, one hundred fifty-five".