6643031998464 has 189 divisors, whose sum is σ = 19213873066843. Its totient is φ = 2211704733696.

The previous prime is 6643031998399. The next prime is 6643031998513. The reversal of 6643031998464 is 4648991303466.

The square root of 6643031998464 is 2577408.

It is a perfect power (a square), and thus also a powerful number.

6643031998464 is a `hidden beast` number, since 6 + 6 + 4 + 303 + 199 + 84 + 64 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7917796957 + ... + 7917797795.

Almost surely, 2^{6643031998464} is an apocalyptic number.

6643031998464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

6643031998464 is the 2577408-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643031998464

6643031998464 is an abundant number, since it is smaller than the sum of its proper divisors (12570841068379).

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

6643031998464 is an frugal number, since it uses more digits than its factorization.

6643031998464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 63.

The spelling of 6643031998464 in words is "six trillion, six hundred forty-three billion, thirty-one million, nine hundred ninety-eight thousand, four hundred sixty-four".