265416660 has 72 divisors (see below), whose sum is σ = 812284200. Its totient is φ = 70146048.

The previous prime is 265416647. The next prime is 265416667. The reversal of 265416660 is 66614562.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 248004 + 265168656 = 498^2 + 16284^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265416667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13816 + ... + 26864.

It is an arithmetic number, because the mean of its divisors is an integer number (11281725).

Almost surely, 2^265416660 is an apocalyptic number.

265416660 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 265416660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406142100).

265416660 is an abundant number, since it is smaller than the sum of its proper divisors (546867540).

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

265416660 is a wasteful number, since it uses less digits than its factorization.

265416660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13177 (or 13172 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 265416660 is about 16291.6131797928. The cubic root of 265416660 is about 642.6522907078.

The spelling of 265416660 in words is "two hundred sixty-five million, four hundred sixteen thousand, six hundred sixty".