56664817 has 4 divisors (see below), whose sum is σ = 61816176. Its totient is φ = 51513460.

The previous prime is 56664809. The next prime is 56664823. The reversal of 56664817 is 71846665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56664817 - 2³ = 56664809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56664857) 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, 2575663 + ... + 2575684.

It is an arithmetic number, because the mean of its divisors is an integer number (15454044).

Almost surely, 2^56664817 is an apocalyptic number.

It is an amenable number.

56664817 is a deficient number, since it is larger than the sum of its proper divisors (5151359).

56664817 is a wasteful number, since it uses less digits than its factorization.

56664817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151358.

The product of its digits is 241920, while the sum is 43.

The square root of 56664817 is about 7527.6036691632. The cubic root of 56664817 is about 384.0942716498.

It can be divided in two parts, 566648 and 17, that added together give a palindrome (566665).

The spelling of 56664817 in words is "fifty-six million, six hundred sixty-four thousand, eight hundred seventeen".