6643314836 has 12 divisors (see below), whose sum is σ = 11631516960. Its totient is φ = 3320024280.

The previous prime is 6643314833. The next prime is 6643314841. The reversal of 6643314836 is 6384133466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643314833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399110 + ... + 415421.

It is an arithmetic number, because the mean of its divisors is an integer number (969293080).

Almost surely, 2^6643314836 is an apocalyptic number.

It is an amenable number.

6643314836 is a deficient number, since it is larger than the sum of its proper divisors (4988202124).

6643314836 is a wasteful number, since it uses less digits than its factorization.

6643314836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816574 (or 816572 counting only the distinct ones).

The product of its digits is 746496, while the sum is 44.

The square root of 6643314836 is about 81506.5324743974. The cubic root of 6643314836 is about 1879.8719955853.

The spelling of 6643314836 in words is "six billion, six hundred forty-three million, three hundred fourteen thousand, eight hundred thirty-six".