666783330 has 64 divisors (see below), whose sum is σ = 1633305600. Its totient is φ = 174170304.

The previous prime is 666783307. The next prime is 666783331. The reversal of 666783330 is 33387666.

It is not an unprimeable number, because it can be changed into a prime (666783331) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 399157 + ... + 400823.

It is an arithmetic number, because the mean of its divisors is an integer number (25520400).

Almost surely, 2^666783330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666783330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816652800).

666783330 is an abundant number, since it is smaller than the sum of its proper divisors (966522270).

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

666783330 is a wasteful number, since it uses less digits than its factorization.

666783330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943.

The product of its (nonzero) digits is 326592, while the sum is 42.

The square root of 666783330 is about 25822.1480516242. The cubic root of 666783330 is about 873.6314191686.

The spelling of 666783330 in words is "six hundred sixty-six million, seven hundred eighty-three thousand, three hundred thirty".