666646033 has 2 divisors, whose sum is σ = 666646034. Its totient is φ = 666646032.

The previous prime is 666645977. The next prime is 666646069. The reversal of 666646033 is 330646666.

666646033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562258944 + 104387089 = 23712^2 + 10217^2 .

It is a cyclic number.

It is not a de Polignac number, because 666646033 - 2²⁵ = 633091601 is a prime.

It is not a weakly prime, because it can be changed into another prime (666646433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333323016 + 333323017.

It is an arithmetic number, because the mean of its divisors is an integer number (333323017).

Almost surely, 2^666646033 is an apocalyptic number.

It is an amenable number.

666646033 is a deficient number, since it is larger than the sum of its proper divisors (1).

666646033 is an equidigital number, since it uses as much as digits as its factorization.

666646033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 40.

The square root of 666646033 is about 25819.4894023875. The cubic root of 666646033 is about 873.5714520593.

The spelling of 666646033 in words is "six hundred sixty-six million, six hundred forty-six thousand, thirty-three".