666812232 has 96 divisors (see below), whose sum is σ = 1875744000. Its totient is φ = 213770880.

The previous prime is 666812231. The next prime is 666812243. The reversal of 666812232 is 232218666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is not an unprimeable number, because it can be changed into a prime (666812231) 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 23 ways as a sum of consecutive naturals, for example, 398694 + ... + 400362.

It is an arithmetic number, because the mean of its divisors is an integer number (19539000).

Almost surely, 2^666812232 is an apocalyptic number.

666812232 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666812232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937872000).

666812232 is an abundant number, since it is smaller than the sum of its proper divisors (1208931768).

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

666812232 is a wasteful number, since it uses less digits than its factorization.

666812232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891 (or 1884 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 666812232 is about 25822.7076814187. The cubic root of 666812232 is about 873.6440416250.

The spelling of 666812232 in words is "six hundred sixty-six million, eight hundred twelve thousand, two hundred thirty-two".