666375089 has 2 divisors, whose sum is σ = 666375090. Its totient is φ = 666375088.

The previous prime is 666375077. The next prime is 666375103. The reversal of 666375089 is 980573666.

666375089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529368064 + 137007025 = 23008^2 + 11705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666375089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (666375019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333187544 + 333187545.

It is an arithmetic number, because the mean of its divisors is an integer number (333187545).

Almost surely, 2^666375089 is an apocalyptic number.

It is an amenable number.

666375089 is a deficient number, since it is larger than the sum of its proper divisors (1).

666375089 is an equidigital number, since it uses as much as digits as its factorization.

666375089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 666375089 is about 25814.2419799614. The cubic root of 666375089 is about 873.4530878876.

The spelling of 666375089 in words is "six hundred sixty-six million, three hundred seventy-five thousand, eighty-nine".