255966 has 16 divisors (see below), whose sum is σ = 526224. Its totient is φ = 82944.

The previous prime is 255961. The next prime is 255971. The reversal of 255966 is 669552.

It is an interprime number because it is at equal distance from previous prime (255961) and next prime (255971).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255961) by changing a digit.

255966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (32889).

2²⁵⁵⁹⁶⁶ is an apocalyptic number.

255966 is an abundant number, since it is smaller than the sum of its proper divisors (270258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255966 is a wasteful number, since it uses less digits than its factorization.

255966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195.

The product of its digits is 16200, while the sum is 33.

The square root of 255966 is about 505.9308253111. The cubic root of 255966 is about 63.4932309316.

It can be divided in two parts, 255 and 966, that added together give a palindrome (1221).

The spelling of 255966 in words is "two hundred fifty-five thousand, nine hundred sixty-six".