56667665 has 16 divisors (see below), whose sum is σ = 69769728. Its totient is φ = 44164416.

The previous prime is 56667629. The next prime is 56667713. The reversal of 56667665 is 56676665.

It is a cyclic number.

It is not a de Polignac number, because 56667665 - 2⁶ = 56667601 is a prime.

It is a super-2 number, since 2×56667665² = 6422448513104450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68444 + ... + 69266.

It is an arithmetic number, because the mean of its divisors is an integer number (4360608).

Almost surely, 2^56667665 is an apocalyptic number.

It is an amenable number.

56667665 is a deficient number, since it is larger than the sum of its proper divisors (13102063).

56667665 is a wasteful number, since it uses less digits than its factorization.

56667665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its digits is 1360800, while the sum is 47.

The square root of 56667665 is about 7527.7928372133. The cubic root of 56667665 is about 384.1007064608.

It can be divided in two parts, 5666 and 7665, that added together give a palindrome (13331).

The spelling of 56667665 in words is "fifty-six million, six hundred sixty-seven thousand, six hundred sixty-five".