6446624660 has 24 divisors (see below), whose sum is σ = 15471899520. Its totient is φ = 2210271264.

The previous prime is 6446624659. The next prime is 6446624761. The reversal of 6446624660 is 664266446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23023520 + ... + 23023799.

It is an arithmetic number, because the mean of its divisors is an integer number (644662480).

Almost surely, 2^6446624660 is an apocalyptic number.

It is an amenable number.

6446624660 is an abundant number, since it is smaller than the sum of its proper divisors (9025274860).

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

6446624660 is a wasteful number, since it uses less digits than its factorization.

6446624660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46047335 (or 46047333 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

The square root of 6446624660 is about 80290.8753221685. The cubic root of 6446624660 is about 1861.1332227948.

The spelling of 6446624660 in words is "six billion, four hundred forty-six million, six hundred twenty-four thousand, six hundred sixty".