265565 has 4 divisors (see below), whose sum is σ = 318684. Its totient is φ = 212448.

The previous prime is 265561. The next prime is 265567. The reversal of 265565 is 565562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 151321 = 338^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 265565 - 2² = 265561 is a prime.

It is a Duffinian 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.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26552 + ... + 26561.

It is an arithmetic number, because the mean of its divisors is an integer number (79671).

2²⁶⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

265565 is a deficient number, since it is larger than the sum of its proper divisors (53119).

265565 is an equidigital number, since it uses as much as digits as its factorization.

265565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53118.

The product of its digits is 9000, while the sum is 29.

The square root of 265565 is about 515.3299913648. The cubic root of 265565 is about 64.2771993425.

The spelling of 265565 in words is "two hundred sixty-five thousand, five hundred sixty-five".