666911232 has 200 divisors, whose sum is σ = 2145406956. Its totient is φ = 205037568.

The previous prime is 666911213. The next prime is 666911237. The reversal of 666911232 is 232119666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 664402176 + 2509056 = 25776^2 + 1584^2 .

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 (666911237) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 538518 + ... + 539754.

Almost surely, 2^666911232 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 666911232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072703478).

666911232 is an abundant number, since it is smaller than the sum of its proper divisors (1478495724).

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

666911232 is a wasteful number, since it uses less digits than its factorization.

666911232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280 (or 1255 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 666911232 is about 25824.6245277642. The cubic root of 666911232 is about 873.6872754250.

The spelling of 666911232 in words is "six hundred sixty-six million, nine hundred eleven thousand, two hundred thirty-two".