56751666 has 16 divisors (see below), whose sum is σ = 117417600. Its totient is φ = 18264848.

The previous prime is 56751659. The next prime is 56751671. The reversal of 56751666 is 66615765.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162906 + ... + 163253.

It is an arithmetic number, because the mean of its divisors is an integer number (7338600).

Almost surely, 2^56751666 is an apocalyptic number.

56751666 is an abundant number, since it is smaller than the sum of its proper divisors (60665934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56751666 is a wasteful number, since it uses less digits than its factorization.

56751666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326193.

The product of its digits is 226800, while the sum is 42.

The square root of 56751666 is about 7533.3701621519. The cubic root of 56751666 is about 384.2904026130.

The spelling of 56751666 in words is "fifty-six million, seven hundred fifty-one thousand, six hundred sixty-six".