56666 has 8 divisors (see below), whose sum is σ = 88020. Its totient is φ = 27328.

The previous prime is 56663. The next prime is 56671. The reversal of 56666 is 66665.

It can be written as a sum of positive squares in 2 ways, for example, as 52441 + 4225 = 229^2 + 65^2 .

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

It is a super-2 number, since 2×56666² = 6422071112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

56666 is a modest number, since divided by 666 gives 56 as remainder.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (56663) 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, 431 + ... + 546.

2⁵⁶⁶⁶⁶ is an apocalyptic number.

56666 is a deficient number, since it is larger than the sum of its proper divisors (31354).

56666 is a wasteful number, since it uses less digits than its factorization.

56666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its digits is 6480, while the sum is 29.

The square root of 56666 is about 238.0462140006. The cubic root of 56666 is about 38.4096944563.

Subtracting 56666 from its reverse (66665), we obtain a palindrome (9999).

The spelling of 56666 in words is "fifty-six thousand, six hundred sixty-six".