6644565632 has 16 divisors (see below), whose sum is σ = 13237220850. Its totient is φ = 3322282752.

The previous prime is 6644565619. The next prime is 6644565643. The reversal of 6644565632 is 2365654466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4555710016 + 2088855616 = 67496^2 + 45704^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25955207 + ... + 25955462.

Almost surely, 2^6644565632 is an apocalyptic number.

It is an amenable number.

6644565632 is a deficient number, since it is larger than the sum of its proper divisors (6592655218).

6644565632 is an equidigital number, since it uses as much as digits as its factorization.

6644565632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51910683 (or 51910671 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 47.

The square root of 6644565632 is about 81514.2050933455. The cubic root of 6644565632 is about 1879.9899682579.

The spelling of 6644565632 in words is "six billion, six hundred forty-four million, five hundred sixty-five thousand, six hundred thirty-two".