6643253982 has 48 divisors (see below), whose sum is σ = 14131750320. Its totient is φ = 2081544192.

The previous prime is 6643253971. The next prime is 6643254001. The reversal of 6643253982 is 2893523466.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1747708 + ... + 1751504.

It is an arithmetic number, because the mean of its divisors is an integer number (294411465).

Almost surely, 2^6643253982 is an apocalyptic number.

6643253982 is an abundant number, since it is smaller than the sum of its proper divisors (7488496338).

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

6643253982 is a wasteful number, since it uses less digits than its factorization.

6643253982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4845 (or 4828 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 48.

The square root of 6643253982 is about 81506.1591660409. The cubic root of 6643253982 is about 1879.8662555753.

The spelling of 6643253982 in words is "six billion, six hundred forty-three million, two hundred fifty-three thousand, nine hundred eighty-two".