6644712465 has 24 divisors (see below), whose sum is σ = 11544892008. Its totient is φ = 3535418880.

The previous prime is 6644712401. The next prime is 6644712479. The reversal of 6644712465 is 5642174466.

It can be written as a sum of positive squares in 4 ways, for example, as 253669329 + 6391043136 = 15927^2 + 79944^2 .

It is not a de Polignac number, because 6644712465 - 2⁶ = 6644712401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6644712465.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156424 + ... + 194313.

It is an arithmetic number, because the mean of its divisors is an integer number (481037167).

Almost surely, 2^6644712465 is an apocalyptic number.

It is an amenable number.

6644712465 is a deficient number, since it is larger than the sum of its proper divisors (4900179543).

6644712465 is a wasteful number, since it uses less digits than its factorization.

6644712465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351169 (or 351166 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 6644712465 is about 81515.1057473399. The cubic root of 6644712465 is about 1880.0038162930.

The spelling of 6644712465 in words is "six billion, six hundred forty-four million, seven hundred twelve thousand, four hundred sixty-five".