56661583 has 16 divisors (see below), whose sum is σ = 64558080. Its totient is φ = 49262400.

The previous prime is 56661569. The next prime is 56661587. The reversal of 56661583 is 38516665.

56661583 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 56661583 - 2¹⁷ = 56530511 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 (56661587) 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 15 ways as a sum of consecutive naturals, for example, 29416 + ... + 31282.

It is an arithmetic number, because the mean of its divisors is an integer number (4034880).

Almost surely, 2^56661583 is an apocalyptic number.

56661583 is a deficient number, since it is larger than the sum of its proper divisors (7896497).

56661583 is a wasteful number, since it uses less digits than its factorization.

56661583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998.

The product of its digits is 129600, while the sum is 40.

The square root of 56661583 is about 7527.3888567019. The cubic root of 56661583 is about 384.0869644436.

The spelling of 56661583 in words is "fifty-six million, six hundred sixty-one thousand, five hundred eighty-three".