56991166 has 16 divisors (see below), whose sum is σ = 87588864. Its totient is φ = 27798904.

The previous prime is 56991161. The next prime is 56991197. The reversal of 56991166 is 66119965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56991161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35211 + ... + 36793.

It is an arithmetic number, because the mean of its divisors is an integer number (5474304).

Almost surely, 2^56991166 is an apocalyptic number.

56991166 is a deficient number, since it is larger than the sum of its proper divisors (30597698).

56991166 is a wasteful number, since it uses less digits than its factorization.

56991166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

The product of its digits is 87480, while the sum is 43.

The square root of 56991166 is about 7549.2493666589. The cubic root of 56991166 is about 384.8302304286.

The spelling of 56991166 in words is "fifty-six million, nine hundred ninety-one thousand, one hundred sixty-six".