6646844336 has 80 divisors (see below), whose sum is σ = 14766554880. Its totient is φ = 2868898560.

The previous prime is 6646844329. The next prime is 6646844353. The reversal of 6646844336 is 6334486466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556766 + ... + 568578.

It is an arithmetic number, because the mean of its divisors is an integer number (184581936).

Almost surely, 2^6646844336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646844336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7383277440).

6646844336 is an abundant number, since it is smaller than the sum of its proper divisors (8119710544).

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

6646844336 is a wasteful number, since it uses less digits than its factorization.

6646844336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11994 (or 11988 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 50.

The square root of 6646844336 is about 81528.1812381461. The cubic root of 6646844336 is about 1880.2048531868.

The spelling of 6646844336 in words is "six billion, six hundred forty-six million, eight hundred forty-four thousand, three hundred thirty-six".