56605665 has 32 divisors (see below), whose sum is σ = 96647040. Its totient is φ = 28191744.

The previous prime is 56605649. The next prime is 56605697. The reversal of 56605665 is 56650665.

It is a happy number.

It is not a de Polignac number, because 56605665 - 2⁴ = 56605649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34647 + ... + 36243.

It is an arithmetic number, because the mean of its divisors is an integer number (3020220).

Almost surely, 2^56605665 is an apocalyptic number.

It is an amenable number.

56605665 is a deficient number, since it is larger than the sum of its proper divisors (40041375).

56605665 is a wasteful number, since it uses less digits than its factorization.

56605665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 56605665 is about 7523.6736372599. The cubic root of 56605665 is about 383.9605740229.

It can be divided in two parts, 5660 and 5665, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 56605665 in words is "fifty-six million, six hundred five thousand, six hundred sixty-five".