56660557 has 4 divisors (see below), whose sum is σ = 56756700. Its totient is φ = 56564416.

The previous prime is 56660497. The next prime is 56660561. The reversal of 56660557 is 75506665.

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 33802596 + 22857961 = 5814^2 + 4781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56660557 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 (56660567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47182 + ... + 48367.

It is an arithmetic number, because the mean of its divisors is an integer number (14189175).

Almost surely, 2^56660557 is an apocalyptic number.

It is an amenable number.

56660557 is a deficient number, since it is larger than the sum of its proper divisors (96143).

56660557 is an equidigital number, since it uses as much as digits as its factorization.

56660557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96142.

The product of its (nonzero) digits is 189000, while the sum is 40.

The square root of 56660557 is about 7527.3207052709. The cubic root of 56660557 is about 384.0846461438.

The spelling of 56660557 in words is "fifty-six million, six hundred sixty thousand, five hundred fifty-seven".