6664443220 has 48 divisors (see below), whose sum is σ = 14085363600. Its totient is φ = 2648687616.

The previous prime is 6664443197. The next prime is 6664443221. The reversal of 6664443220 is 223444666.

It can be written as a sum of positive squares in 8 ways, for example, as 6724 + 6664436496 = 82^2 + 81636^2 .

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6664443220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664443221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2184256 + ... + 2187304.

It is an arithmetic number, because the mean of its divisors is an integer number (293445075).

Almost surely, 2^6664443220 is an apocalyptic number.

It is an amenable number.

6664443220 is an abundant number, since it is smaller than the sum of its proper divisors (7420920380).

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

6664443220 is a wasteful number, since it uses less digits than its factorization.

6664443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

The square root of 6664443220 is about 81636.0411828011. The cubic root of 6664443220 is about 1881.8628001545.

Adding to 6664443220 its reverse (223444666), we get a palindrome (6887887886).

The spelling of 6664443220 in words is "six billion, six hundred sixty-four million, four hundred forty-three thousand, two hundred twenty".