6643022321 has 4 divisors (see below), whose sum is σ = 7154024052. Its totient is φ = 6132020592.

The previous prime is 6643022303. The next prime is 6643022327. The reversal of 6643022321 is 1232203466.

6643022321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 486423025 + 6156599296 = 22055^2 + 78464^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643022321 - 2¹⁸ = 6642760177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643022327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255500846 + ... + 255500871.

It is an arithmetic number, because the mean of its divisors is an integer number (1788506013).

Almost surely, 2^6643022321 is an apocalyptic number.

It is an amenable number.

6643022321 is a deficient number, since it is larger than the sum of its proper divisors (511001731).

6643022321 is a wasteful number, since it uses less digits than its factorization.

6643022321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511001730.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 6643022321 is about 81504.7380279208. The cubic root of 6643022321 is about 1879.8444039968.

Adding to 6643022321 its reverse (1232203466), we get a palindrome (7875225787).

The spelling of 6643022321 in words is "six billion, six hundred forty-three million, twenty-two thousand, three hundred twenty-one".