665263265 has 16 divisors (see below), whose sum is σ = 808163136. Its totient is φ = 525672000.

The previous prime is 665263243. The next prime is 665263279. The reversal of 665263265 is 562362566.

665263265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665263265 - 2⁸ = 665263009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246614 + ... + 249296.

It is an arithmetic number, because the mean of its divisors is an integer number (50510196).

Almost surely, 2^665263265 is an apocalyptic number.

It is an amenable number.

665263265 is a deficient number, since it is larger than the sum of its proper divisors (142899871).

665263265 is a wasteful number, since it uses less digits than its factorization.

665263265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280.

The product of its digits is 388800, while the sum is 41.

The square root of 665263265 is about 25792.6979007625. The cubic root of 665263265 is about 872.9670419554.

The spelling of 665263265 in words is "six hundred sixty-five million, two hundred sixty-three thousand, two hundred sixty-five".