666666631224 has 128 divisors (see below), whose sum is σ = 2021118739200. Its totient is φ = 201928510080.

The previous prime is 666666631207. The next prime is 666666631229. The reversal of 666666631224 is 422136666666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666631229) 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 31 ways as a sum of consecutive naturals, for example, 5266822 + ... + 5391914.

It is an arithmetic number, because the mean of its divisors is an integer number (15789990150).

Almost surely, 2^666666631224 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 666666631224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010559369600).

666666631224 is an abundant number, since it is smaller than the sum of its proper divisors (1354452107976).

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

666666631224 is a wasteful number, since it uses less digits than its factorization.

666666631224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127362 (or 127352 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 54.

The spelling of 666666631224 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred thirty-one thousand, two hundred twenty-four".