56661566 has 8 divisors (see below), whose sum is σ = 91530264. Its totient is φ = 26151480.

The previous prime is 56661559. The next prime is 56661569. The reversal of 56661566 is 66516665.

56661566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089620 + ... + 1089671.

It is an arithmetic number, because the mean of its divisors is an integer number (11441283).

Almost surely, 2^56661566 is an apocalyptic number.

56661566 is a deficient number, since it is larger than the sum of its proper divisors (34868698).

56661566 is a wasteful number, since it uses less digits than its factorization.

56661566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179306.

The product of its digits is 194400, while the sum is 41.

The square root of 56661566 is about 7527.3877274922. The cubic root of 56661566 is about 384.0869260314.

The spelling of 56661566 in words is "fifty-six million, six hundred sixty-one thousand, five hundred sixty-six".