66332689 has 2 divisors, whose sum is σ = 66332690. Its totient is φ = 66332688.

The previous prime is 66332683. The next prime is 66332701. The reversal of 66332689 is 98623366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57380625 + 8952064 = 7575^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 66332689 - 2⁹ = 66332177 is a prime.

It is not a weakly prime, because it can be changed into another prime (66332683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33166344 + 33166345.

It is an arithmetic number, because the mean of its divisors is an integer number (33166345).

Almost surely, 2^66332689 is an apocalyptic number.

It is an amenable number.

66332689 is a deficient number, since it is larger than the sum of its proper divisors (1).

66332689 is an equidigital number, since it uses as much as digits as its factorization.

66332689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 43.

The square root of 66332689 is about 8144.4882589393. The cubic root of 66332689 is about 404.8018926449.

The spelling of 66332689 in words is "sixty-six million, three hundred thirty-two thousand, six hundred eighty-nine".