56661505055 has 16 divisors (see below), whose sum is σ = 68284206144. Its totient is φ = 45135767040.

The previous prime is 56661505013. The next prime is 56661505067. The reversal of 56661505055 is 55050516665.

It is a de Polignac number, because none of the positive numbers 2^k-56661505055 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56661504997 and 56661505015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3195815 + ... + 3213495.

It is an arithmetic number, because the mean of its divisors is an integer number (4267762884).

Almost surely, 2^56661505055 is an apocalyptic number.

56661505055 is a deficient number, since it is larger than the sum of its proper divisors (11622701089).

56661505055 is a wasteful number, since it uses less digits than its factorization.

56661505055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20386.

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 56661505055 in words is "fifty-six billion, six hundred sixty-one million, five hundred five thousand, fifty-five".