669508589 has 2 divisors, whose sum is σ = 669508590. Its totient is φ = 669508588.

The previous prime is 669508573. The next prime is 669508597. The reversal of 669508589 is 985805966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446603689 + 222904900 = 21133^2 + 14930^2 .

It is a cyclic number.

It is not a de Polignac number, because 669508589 - 2⁴ = 669508573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669501589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334754294 + 334754295.

It is an arithmetic number, because the mean of its divisors is an integer number (334754295).

Almost surely, 2^669508589 is an apocalyptic number.

It is an amenable number.

669508589 is a deficient number, since it is larger than the sum of its proper divisors (1).

669508589 is an equidigital number, since it uses as much as digits as its factorization.

669508589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The square root of 669508589 is about 25874.8640382901. The cubic root of 669508589 is about 874.8200289451.

The spelling of 669508589 in words is "six hundred sixty-nine million, five hundred eight thousand, five hundred eighty-nine".