6664399344 has 120 divisors (see below), whose sum is σ = 19485752832. Its totient is φ = 2123786880.

The previous prime is 6664399327. The next prime is 6664399363. The reversal of 6664399344 is 4439934666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 361519 + ... + 379505.

Almost surely, 2^6664399344 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 6664399344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9742876416).

6664399344 is an abundant number, since it is smaller than the sum of its proper divisors (12821353488).

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

6664399344 is a wasteful number, since it uses less digits than its factorization.

6664399344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18115 (or 18106 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 54.

The square root of 6664399344 is about 81635.7724530123. The cubic root of 6664399344 is about 1881.8586703375.

The spelling of 6664399344 in words is "six billion, six hundred sixty-four million, three hundred ninety-nine thousand, three hundred forty-four".