666089 has 2 divisors, whose sum is σ = 666090. Its totient is φ = 666088.

The previous prime is 666079. The next prime is 666091. The reversal of 666089 is 980666.

666089 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., 652864 + 13225 = 808^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 666089 - 2⁴ = 666073 is a prime.

Together with 666091, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁶ + 6⁷ + 0 + 6⁷ + 8³ + 9⁵ .

It is not a weakly prime, because it can be changed into another prime (666019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333044 + 333045.

It is an arithmetic number, because the mean of its divisors is an integer number (333045).

2⁶⁶⁶⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

666089 is a deficient number, since it is larger than the sum of its proper divisors (1).

666089 is an equidigital number, since it uses as much as digits as its factorization.

666089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 666089 is about 816.1427571203. The cubic root of 666089 is about 87.3328072665.

The spelling of 666089 in words is "six hundred sixty-six thousand, eighty-nine".