6643325660 has 24 divisors (see below), whose sum is σ = 14187443760. Its totient is φ = 2612290304.

The previous prime is 6643325581. The next prime is 6643325669. The reversal of 6643325660 is 665233466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643325669) 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 7 ways as a sum of consecutive naturals, for example, 2813789 + ... + 2816148.

It is an arithmetic number, because the mean of its divisors is an integer number (591143490).

Almost surely, 2^6643325660 is an apocalyptic number.

It is an amenable number.

6643325660 is an abundant number, since it is smaller than the sum of its proper divisors (7544118100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6643325660 is a wasteful number, since it uses less digits than its factorization.

6643325660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5630005 (or 5630003 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 41.

The square root of 6643325660 is about 81506.5988739562. The cubic root of 6643325660 is about 1879.8730165477.

The spelling of 6643325660 in words is "six billion, six hundred forty-three million, three hundred twenty-five thousand, six hundred sixty".