265566 has 16 divisors (see below), whose sum is σ = 607104. Its totient is φ = 75864.

The previous prime is 265561. The next prime is 265567. The reversal of 265566 is 665562.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265561) by changing a digit.

265566 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, 3120 + ... + 3203.

It is an arithmetic number, because the mean of its divisors is an integer number (37944).

2²⁶⁵⁵⁶⁶ is an apocalyptic number.

265566 is an abundant number, since it is smaller than the sum of its proper divisors (341538).

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

265566 is a wasteful number, since it uses less digits than its factorization.

265566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6335.

The product of its digits is 10800, while the sum is 30.

The square root of 265566 is about 515.3309616159. The cubic root of 265566 is about 64.2772800222.

It can be divided in two parts, 26556 and 6, that added together give a palindrome (26562).

The spelling of 265566 in words is "two hundred sixty-five thousand, five hundred sixty-six".