265565220 has 96 divisors (see below), whose sum is σ = 779390976. Its totient is φ = 67478400.

The previous prime is 265565203. The next prime is 265565249. The reversal of 265565220 is 22565562.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123555 + ... + 125685.

It is an arithmetic number, because the mean of its divisors is an integer number (8118656).

Almost surely, 2^265565220 is an apocalyptic number.

265565220 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 265565220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389695488).

265565220 is an abundant number, since it is smaller than the sum of its proper divisors (513825756).

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

265565220 is a wasteful number, since it uses less digits than its factorization.

265565220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241 (or 2239 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 265565220 is about 16296.1719431282. The cubic root of 265565220 is about 642.7721709207.

The spelling of 265565220 in words is "two hundred sixty-five million, five hundred sixty-five thousand, two hundred twenty".