666249432 has 64 divisors (see below), whose sum is σ = 1702944000. Its totient is φ = 217137024.

The previous prime is 666249403. The next prime is 666249443. The reversal of 666249432 is 234942666.

666249432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455919 + ... + 457377.

It is an arithmetic number, because the mean of its divisors is an integer number (26608500).

Almost surely, 2^666249432 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 666249432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851472000).

666249432 is an abundant number, since it is smaller than the sum of its proper divisors (1036694568).

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

666249432 is a wasteful number, since it uses less digits than its factorization.

666249432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1876 counting only the distinct ones).

The product of its digits is 373248, while the sum is 42.

The square root of 666249432 is about 25811.8079955667. The cubic root of 666249432 is about 873.3981826768.

The spelling of 666249432 in words is "six hundred sixty-six million, two hundred forty-nine thousand, four hundred thirty-two".