6643429586920 has 32 divisors (see below), whose sum is σ = 17083104652800. Its totient is φ = 2277747286848.

The previous prime is 6643429586909. The next prime is 6643429586929. The reversal of 6643429586920 is 296859243466.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6643429586929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11863266840 + ... + 11863267399.

It is an arithmetic number, because the mean of its divisors is an integer number (533847020400).

Almost surely, 2^{6643429586920} is an apocalyptic number.

It is an amenable number.

6643429586920 is an abundant number, since it is smaller than the sum of its proper divisors (10439675065880).

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

6643429586920 is a wasteful number, since it uses less digits than its factorization.

6643429586920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23726534257 (or 23726534253 counting only the distinct ones).

The product of its (nonzero) digits is 134369280, while the sum is 64.

The spelling of 6643429586920 in words is "six trillion, six hundred forty-three billion, four hundred twenty-nine million, five hundred eighty-six thousand, nine hundred twenty".