669771589 has 2 divisors, whose sum is σ = 669771590. Its totient is φ = 669771588.

The previous prime is 669771551. The next prime is 669771629. The reversal of 669771589 is 985177966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664092900 + 5678689 = 25770^2 + 2383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669771589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669771889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334885794 + 334885795.

It is an arithmetic number, because the mean of its divisors is an integer number (334885795).

Almost surely, 2^669771589 is an apocalyptic number.

It is an amenable number.

669771589 is a deficient number, since it is larger than the sum of its proper divisors (1).

669771589 is an equidigital number, since it uses as much as digits as its factorization.

669771589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 58.

The square root of 669771589 is about 25879.9456915968. The cubic root of 669771589 is about 874.9345644672.

The spelling of 669771589 in words is "six hundred sixty-nine million, seven hundred seventy-one thousand, five hundred eighty-nine".