56664805 has 4 divisors (see below), whose sum is σ = 67997772. Its totient is φ = 45331840.

The previous prime is 56664799. The next prime is 56664809. The reversal of 56664805 is 50846665.

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 41563809 + 15100996 = 6447^2 + 3886^2 .

It is not a de Polignac number, because 56664805 - 2¹⁷ = 56533733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56664809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5666476 + ... + 5666485.

It is an arithmetic number, because the mean of its divisors is an integer number (16999443).

Almost surely, 2^56664805 is an apocalyptic number.

It is an amenable number.

56664805 is a deficient number, since it is larger than the sum of its proper divisors (11332967).

56664805 is a wasteful number, since it uses less digits than its factorization.

56664805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332966.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 56664805 is about 7527.6028720968. The cubic root of 56664805 is about 384.0942445364.

The spelling of 56664805 in words is "fifty-six million, six hundred sixty-four thousand, eight hundred five".