66489589 has 2 divisors, whose sum is σ = 66489590. Its totient is φ = 66489588.

The previous prime is 66489571. The next prime is 66489691. The reversal of 66489589 is 98598466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 311364 = 8135^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 66489589 - 2¹⁹ = 65965301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66489529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33244794 + 33244795.

It is an arithmetic number, because the mean of its divisors is an integer number (33244795).

Almost surely, 2^66489589 is an apocalyptic number.

It is an amenable number.

66489589 is a deficient number, since it is larger than the sum of its proper divisors (1).

66489589 is an equidigital number, since it uses as much as digits as its factorization.

66489589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 55.

The square root of 66489589 is about 8154.1148507977. The cubic root of 66489589 is about 405.1208073282.

The spelling of 66489589 in words is "sixty-six million, four hundred eighty-nine thousand, five hundred eighty-nine".