666335320 has 192 divisors, whose sum is σ = 1902204000. Its totient is φ = 208631808.

The previous prime is 666335317. The next prime is 666335333. The reversal of 666335320 is 23533666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1079652 + ... + 1080268.

Almost surely, 2^666335320 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 666335320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951102000).

666335320 is an abundant number, since it is smaller than the sum of its proper divisors (1235868680).

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

666335320 is a wasteful number, since it uses less digits than its factorization.

666335320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 34.

The square root of 666335320 is about 25813.4716766265. The cubic root of 666335320 is about 873.4357117644.

Adding to 666335320 its reverse (23533666), we get a palindrome (689868986).

The spelling of 666335320 in words is "six hundred sixty-six million, three hundred thirty-five thousand, three hundred twenty".