6643345904 has 40 divisors (see below), whose sum is σ = 14017384080. Its totient is φ = 3031699968.

The previous prime is 6643345903. The next prime is 6643345909. The reversal of 6643345904 is 4095433466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643345903) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 160922 + ... + 197945.

It is an arithmetic number, because the mean of its divisors is an integer number (350434602).

Almost surely, 2^6643345904 is an apocalyptic number.

It is an amenable number.

6643345904 is an abundant number, since it is smaller than the sum of its proper divisors (7374038176).

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

6643345904 is a wasteful number, since it uses less digits than its factorization.

6643345904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358977 (or 358971 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 44.

The square root of 6643345904 is about 81506.7230601255. The cubic root of 6643345904 is about 1879.8749260386.

The spelling of 6643345904 in words is "six billion, six hundred forty-three million, three hundred forty-five thousand, nine hundred four".