665535264 has 24 divisors (see below), whose sum is σ = 1747030320. Its totient is φ = 221845056.

The previous prime is 665535259. The next prime is 665535301. The reversal of 665535264 is 462535566.

It is a tau number, because it is divible by the number of its divisors (24).

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 3 ways as a sum of consecutive naturals, for example, 3466234 + ... + 3466425.

It is an arithmetic number, because the mean of its divisors is an integer number (72792930).

Almost surely, 2^665535264 is an apocalyptic number.

It is an amenable number.

665535264 is an abundant number, since it is smaller than the sum of its proper divisors (1081495056).

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

665535264 is a wasteful number, since it uses less digits than its factorization.

665535264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6932672 (or 6932664 counting only the distinct ones).

The product of its digits is 648000, while the sum is 42.

The square root of 665535264 is about 25797.9701527078. The cubic root of 665535264 is about 873.0859992773.

It can be divided in two parts, 66553 and 5264, that added together give a palindrome (71817).

The spelling of 665535264 in words is "six hundred sixty-five million, five hundred thirty-five thousand, two hundred sixty-four".