6644770444400 has 120 divisors (see below), whose sum is σ = 18172528205184. Its totient is φ = 2311224467200.

The previous prime is 6644770444391. The next prime is 6644770444451. The reversal of 6644770444400 is 44440774466.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 32728694 + ... + 32931093.

Almost surely, 2^{6644770444400} is an apocalyptic number.

It is an amenable number.

6644770444400 is an abundant number, since it is smaller than the sum of its proper divisors (11527757760784).

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

6644770444400 is a wasteful number, since it uses less digits than its factorization.

6644770444400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65659839 (or 65659828 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 50.

The spelling of 6644770444400 in words is "six trillion, six hundred forty-four billion, seven hundred seventy million, four hundred forty-four thousand, four hundred".