56661771 has 16 divisors (see below), whose sum is σ = 77356800. Its totient is φ = 36879648.

The previous prime is 56661757. The next prime is 56661779. The reversal of 56661771 is 17716665.

It is not a de Polignac number, because 56661771 - 2⁷ = 56661643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56661779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26770 + ... + 28808.

It is an arithmetic number, because the mean of its divisors is an integer number (4834800).

Almost surely, 2^56661771 is an apocalyptic number.

56661771 is a deficient number, since it is larger than the sum of its proper divisors (20695029).

56661771 is a wasteful number, since it uses less digits than its factorization.

56661771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258.

The product of its digits is 52920, while the sum is 39.

The square root of 56661771 is about 7527.4013444216. The cubic root of 56661771 is about 384.0873892362.

The spelling of 56661771 in words is "fifty-six million, six hundred sixty-one thousand, seven hundred seventy-one".