56665645 has 8 divisors (see below), whose sum is σ = 69113880. Its totient is φ = 44589120.

The previous prime is 56665633. The next prime is 56665663. The reversal of 56665645 is 54656665.

It can be written as a sum of positive squares in 4 ways, for example, as 550564 + 56115081 = 742^2 + 7491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56665645 - 2⁷ = 56665517 is a prime.

It is a super-3 number, since 3×56665645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92590 + ... + 93199.

It is an arithmetic number, because the mean of its divisors is an integer number (8639235).

Almost surely, 2^56665645 is an apocalyptic number.

It is an amenable number.

56665645 is a deficient number, since it is larger than the sum of its proper divisors (12448235).

56665645 is a wasteful number, since it uses less digits than its factorization.

56665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185855.

The product of its digits is 648000, while the sum is 43.

The square root of 56665645 is about 7527.6586665443. The cubic root of 56665645 is about 384.0961424668.

It can be divided in two parts, 5666 and 5645, that added together give a palindrome (11311).

The spelling of 56665645 in words is "fifty-six million, six hundred sixty-five thousand, six hundred forty-five".