265321660 has 48 divisors (see below), whose sum is σ = 573441120. Its totient is φ = 103055360.

The previous prime is 265321633. The next prime is 265321663. The reversal of 265321660 is 66123562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265321663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210111 + ... + 211369.

It is an arithmetic number, because the mean of its divisors is an integer number (11946690).

Almost surely, 2^265321660 is an apocalyptic number.

265321660 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 265321660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286720560).

265321660 is an abundant number, since it is smaller than the sum of its proper divisors (308119460).

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

265321660 is a wasteful number, since it uses less digits than its factorization.

265321660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1564 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 265321660 is about 16288.6973082564. The cubic root of 265321660 is about 642.5756071855.

The spelling of 265321660 in words is "two hundred sixty-five million, three hundred twenty-one thousand, six hundred sixty".