6421664423226 has 32 divisors (see below), whose sum is σ = 14058019479168. Its totient is φ = 1943504994240.

The previous prime is 6421664423177. The next prime is 6421664423231. The reversal of 6421664423226 is 6223244661246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674823366 + ... + 674832881.

It is an arithmetic number, because the mean of its divisors is an integer number (439313108724).

Almost surely, 2^{6421664423226} is an apocalyptic number.

6421664423226 is an abundant number, since it is smaller than the sum of its proper divisors (7636355055942).

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

6421664423226 is a wasteful number, since it uses less digits than its factorization.

6421664423226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349656326.

The product of its digits is 3981312, while the sum is 48.

The spelling of 6421664423226 in words is "six trillion, four hundred twenty-one billion, six hundred sixty-four million, four hundred twenty-three thousand, two hundred twenty-six".