6440560265 has 16 divisors (see below), whose sum is σ = 8146040400. Its totient is φ = 4880908032.

The previous prime is 6440560261. The next prime is 6440560297. The reversal of 6440560265 is 5620650446.

6440560265 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 551686144 + 5888874121 = 23488^2 + 76739^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440560265 - 2² = 6440560261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6440560261) 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 15 ways as a sum of consecutive naturals, for example, 411350 + ... + 426719.

It is an arithmetic number, because the mean of its divisors is an integer number (509127525).

Almost surely, 2^6440560265 is an apocalyptic number.

It is an amenable number.

6440560265 is a deficient number, since it is larger than the sum of its proper divisors (1705480135).

6440560265 is a wasteful number, since it uses less digits than its factorization.

6440560265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838156.

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 6440560265 is about 80253.1012796390. The cubic root of 6440560265 is about 1860.5494450504.

The spelling of 6440560265 in words is "six billion, four hundred forty million, five hundred sixty thousand, two hundred sixty-five".