666623232 has 216 divisors, whose sum is σ = 2171463840. Its totient is φ = 194826240.

The previous prime is 666623183. The next prime is 666623249. The reversal of 666623232 is 232326666.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 734523 + ... + 735429.

Almost surely, 2^666623232 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 666623232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085731920).

666623232 is an abundant number, since it is smaller than the sum of its proper divisors (1504840608).

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

666623232 is a wasteful number, since it uses less digits than its factorization.

666623232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 952 counting only the distinct ones).

The product of its digits is 93312, while the sum is 36.

The square root of 666623232 is about 25819.0478523124. The cubic root of 666623232 is about 873.5614924861.

Adding to 666623232 its reverse (232326666), we get a palindrome (898949898).

The spelling of 666623232 in words is "six hundred sixty-six million, six hundred twenty-three thousand, two hundred thirty-two".