6644446666 has 16 divisors (see below), whose sum is σ = 11709095328. Its totient is φ = 2787879600.

The previous prime is 6644446663. The next prime is 6644446727. The reversal of 6644446666 is 6666444466.

It is a happy number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6644446663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11615880 + ... + 11616451.

It is an arithmetic number, because the mean of its divisors is an integer number (731818458).

It is a self-describing number.

Almost surely, 2^6644446666 is an apocalyptic number.

6644446666 is a deficient number, since it is larger than the sum of its proper divisors (5064648662).

6644446666 is a wasteful number, since it uses less digits than its factorization.

6644446666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23232357.

The product of its digits is 11943936, while the sum is 52.

The square root of 6644446666 is about 81513.4753645065. The cubic root of 6644446666 is about 1879.9787482508.

The spelling of 6644446666 in words is "six billion, six hundred forty-four million, four hundred forty-six thousand, six hundred sixty-six".