666340992 has 224 divisors, whose sum is σ = 2054686980. Its totient is φ = 214990848.

The previous prime is 666340973. The next prime is 666341023. The reversal of 666340992 is 299043666.

666340992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 660695616 + 5645376 = 25704^2 + 2376^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3452448 + ... + 3452640.

Almost surely, 2^666340992 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 666340992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027343490).

666340992 is an abundant number, since it is smaller than the sum of its proper divisors (1388345988).

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

666340992 is an equidigital number, since it uses as much as digits as its factorization.

666340992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 666340992 is about 25813.5815415064. The cubic root of 666340992 is about 873.4381900528.

The spelling of 666340992 in words is "six hundred sixty-six million, three hundred forty thousand, nine hundred ninety-two".