66066617 has 2 divisors, whose sum is σ = 66066618. Its totient is φ = 66066616.

The previous prime is 66066587. The next prime is 66066643. The reversal of 66066617 is 71666066.

It is a happy number.

66066617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 12645136 = 7309^2 + 3556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66066617 is a prime.

It is not a weakly prime, because it can be changed into another prime (66066647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33033308 + 33033309.

It is an arithmetic number, because the mean of its divisors is an integer number (33033309).

Almost surely, 2^66066617 is an apocalyptic number.

It is an amenable number.

66066617 is a deficient number, since it is larger than the sum of its proper divisors (1).

66066617 is an equidigital number, since it uses as much as digits as its factorization.

66066617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66066617 is about 8128.1373635046. The cubic root of 66066617 is about 404.2599236581.

The spelling of 66066617 in words is "sixty-six million, sixty-six thousand, six hundred seventeen".