56066056661 has 4 divisors (see below), whose sum is σ = 59364060012. Its totient is φ = 52768053312.

The previous prime is 56066056603. The next prime is 56066056687. The reversal of 56066056661 is 16665066065.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21905776036 + 34160280625 = 148006^2 + 184825^2 .

It is not a de Polignac number, because 56066056661 - 2¹⁸ = 56065794517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56066056561) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1649001650 + ... + 1649001683.

It is an arithmetic number, because the mean of its divisors is an integer number (14841015003).

Almost surely, 2^56066056661 is an apocalyptic number.

It is an amenable number.

56066056661 is a deficient number, since it is larger than the sum of its proper divisors (3298003351).

56066056661 is a wasteful number, since it uses less digits than its factorization.

56066056661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298003350.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 56066056661 in words is "fifty-six billion, sixty-six million, fifty-six thousand, six hundred sixty-one".