666744200 has 96 divisors (see below), whose sum is σ = 1653168000. Its totient is φ = 249350400.

The previous prime is 666744163. The next prime is 666744203. The reversal of 666744200 is 2447666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666744203) 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 23 ways as a sum of consecutive naturals, for example, 299090 + ... + 301310.

It is an arithmetic number, because the mean of its divisors is an integer number (17220500).

Almost surely, 2^666744200 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 666744200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826584000).

666744200 is an abundant number, since it is smaller than the sum of its proper divisors (986423800).

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

666744200 is a wasteful number, since it uses less digits than its factorization.

666744200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 666744200 is about 25821.3903576086. The cubic root of 666744200 is about 873.6143292262.

The spelling of 666744200 in words is "six hundred sixty-six million, seven hundred forty-four thousand, two hundred".