6643299768 has 64 divisors (see below), whose sum is σ = 19165186560. Its totient is φ = 1879652736.

The previous prime is 6643299731. The next prime is 6643299809. The reversal of 6643299768 is 8679923466.

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 15 ways as a sum of consecutive naturals, for example, 174655 + ... + 209262.

It is an arithmetic number, because the mean of its divisors is an integer number (299456040).

Almost surely, 2^6643299768 is an apocalyptic number.

It is an amenable number.

6643299768 is an abundant number, since it is smaller than the sum of its proper divisors (12521886792).

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

6643299768 is a wasteful number, since it uses less digits than its factorization.

6643299768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384036 (or 384032 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 60.

The square root of 6643299768 is about 81506.4400400361. The cubic root of 6643299768 is about 1879.8705743103.

The spelling of 6643299768 in words is "six billion, six hundred forty-three million, two hundred ninety-nine thousand, seven hundred sixty-eight".