265907664 has 120 divisors (see below), whose sum is σ = 839112960. Its totient is φ = 80562240.

The previous prime is 265907651. The next prime is 265907671. The reversal of 265907664 is 466709562.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 49729 + ... + 54815.

It is an arithmetic number, because the mean of its divisors is an integer number (6992608).

Almost surely, 2^265907664 is an apocalyptic number.

265907664 is a gapful number since it is divisible by the number (24) 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 265907664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419556480).

265907664 is an abundant number, since it is smaller than the sum of its proper divisors (573205296).

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

265907664 is a wasteful number, since it uses less digits than its factorization.

265907664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126 (or 5103 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 265907664 is about 16306.6754428976. The cubic root of 265907664 is about 643.0483352587.

The spelling of 265907664 in words is "two hundred sixty-five million, nine hundred seven thousand, six hundred sixty-four".