265660 has 24 divisors (see below), whose sum is σ = 574560. Its totient is φ = 103104.

The previous prime is 265621. The next prime is 265703. The reversal of 265660 is 66562.

265660 = T₄₅ + T₄₆ + ... + T₁₁₈.

It is a congruent number.

It is an unprimeable number.

265660 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, 561 + ... + 919.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2²⁶⁵⁶⁶⁰ is an apocalyptic number.

265660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287280).

265660 is an abundant number, since it is smaller than the sum of its proper divisors (308900).

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

265660 is a wasteful number, since it uses less digits than its factorization.

265660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 265660 is about 515.4221570713. The cubic root of 265660 is about 64.2848630105.

The spelling of 265660 in words is "two hundred sixty-five thousand, six hundred sixty".