56666857 has 4 divisors (see below), whose sum is σ = 61025860. Its totient is φ = 52307856.

The previous prime is 56666849. The next prime is 56666861. The reversal of 56666857 is 75866665.

56666857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27625536 + 29041321 = 5256^2 + 5389^2 .

It is a cyclic number.

It is not a de Polignac number, because 56666857 - 2³ = 56666849 is a prime.

It is a super-2 number, since 2×56666857² = 6422265364516898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56666857.

It is not an unprimeable number, because it can be changed into a prime (56666807) 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, 2179482 + ... + 2179507.

It is an arithmetic number, because the mean of its divisors is an integer number (15256465).

Almost surely, 2^56666857 is an apocalyptic number.

It is an amenable number.

56666857 is a deficient number, since it is larger than the sum of its proper divisors (4359003).

56666857 is a wasteful number, since it uses less digits than its factorization.

56666857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359002.

The product of its digits is 1814400, while the sum is 49.

The square root of 56666857 is about 7527.7391692327. The cubic root of 56666857 is about 384.0988808762.

The spelling of 56666857 in words is "fifty-six million, six hundred sixty-six thousand, eight hundred fifty-seven".