66566 has 8 divisors (see below), whose sum is σ = 101304. Its totient is φ = 32800.

The previous prime is 66553. The next prime is 66569.

66566 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66569) 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, 35 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (12663).

2⁶⁶⁵⁶⁶ is an apocalyptic number.

66566 is a deficient number, since it is larger than the sum of its proper divisors (34738).

66566 is a wasteful number, since it uses less digits than its factorization.

66566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

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

The square root of 66566 is about 258.0038759399. The cubic root of 66566 is about 40.5275938559.

The spelling of 66566 in words is "sixty-six thousand, five hundred sixty-six".