666329329 has 2 divisors, whose sum is σ = 666329330. Its totient is φ = 666329328.

The previous prime is 666329309. The next prime is 666329353. The reversal of 666329329 is 923923666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550981729 + 115347600 = 23473^2 + 10740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666329329 is a prime.

It is not a weakly prime, because it can be changed into another prime (666329309) 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 as a sum of consecutive naturals, namely, 333164664 + 333164665.

It is an arithmetic number, because the mean of its divisors is an integer number (333164665).

Almost surely, 2^666329329 is an apocalyptic number.

It is an amenable number.

666329329 is a deficient number, since it is larger than the sum of its proper divisors (1).

666329329 is an equidigital number, since it uses as much as digits as its factorization.

666329329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 46.

The square root of 666329329 is about 25813.3556323079. The cubic root of 666329329 is about 873.4330940789.

The spelling of 666329329 in words is "six hundred sixty-six million, three hundred twenty-nine thousand, three hundred twenty-nine".