667986589 has 2 divisors, whose sum is σ = 667986590. Its totient is φ = 667986588.

The previous prime is 667986581. The next prime is 667986611. The reversal of 667986589 is 985689766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589664089 + 78322500 = 24283^2 + 8850^2 .

It is a cyclic number.

It is not a de Polignac number, because 667986589 - 2³ = 667986581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667986589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667986581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333993294 + 333993295.

It is an arithmetic number, because the mean of its divisors is an integer number (333993295).

Almost surely, 2^667986589 is an apocalyptic number.

It is an amenable number.

667986589 is a deficient number, since it is larger than the sum of its proper divisors (1).

667986589 is an equidigital number, since it uses as much as digits as its factorization.

667986589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 64.

The square root of 667986589 is about 25845.4365217537. The cubic root of 667986589 is about 874.1566138501.

The spelling of 667986589 in words is "six hundred sixty-seven million, nine hundred eighty-six thousand, five hundred eighty-nine".