6643022320 has 80 divisors (see below), whose sum is σ = 16913774592. Its totient is φ = 2406375680.

The previous prime is 6643022303. The next prime is 6643022327. The reversal of 6643022320 is 232203466.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217089 + ... + 245791.

Almost surely, 2^6643022320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643022320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8456887296).

6643022320 is an abundant number, since it is smaller than the sum of its proper divisors (10270752272).

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

6643022320 is a wasteful number, since it uses less digits than its factorization.

6643022320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28990 (or 28984 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 6643022320 is about 81504.7380217862. The cubic root of 6643022320 is about 1879.8444039025.

Adding to 6643022320 its reverse (232203466), we get a palindrome (6875225786).

The spelling of 6643022320 in words is "six billion, six hundred forty-three million, twenty-two thousand, three hundred twenty".