721646265 has 16 divisors (see below), whose sum is σ = 1167609600. Its totient is φ = 380552832.

The previous prime is 721646257. The next prime is 721646269. The reversal of 721646265 is 562646127.

721646265 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 721646265 - 2³ = 721646257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721646269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268945 + ... + 271614.

It is an arithmetic number, because the mean of its divisors is an integer number (72975600).

Almost surely, 2^721646265 is an apocalyptic number.

It is an amenable number.

721646265 is a deficient number, since it is larger than the sum of its proper divisors (445963335).

721646265 is a wasteful number, since it uses less digits than its factorization.

721646265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540656.

The product of its digits is 120960, while the sum is 39.

The square root of 721646265 is about 26863.4745518892. The cubic root of 721646265 is about 896.9635385728.

The spelling of 721646265 in words is "seven hundred twenty-one million, six hundred forty-six thousand, two hundred sixty-five".