66888317 has 2 divisors, whose sum is σ = 66888318. Its totient is φ = 66888316.

The previous prime is 66888299. The next prime is 66888323. The reversal of 66888317 is 71388866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65108761 + 1779556 = 8069^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 66888317 - 2⁶ = 66888253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66888337) 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, 33444158 + 33444159.

It is an arithmetic number, because the mean of its divisors is an integer number (33444159).

Almost surely, 2^66888317 is an apocalyptic number.

It is an amenable number.

66888317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888317 is an equidigital number, since it uses as much as digits as its factorization.

66888317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 66888317 is about 8178.5278015056. The cubic root of 66888317 is about 405.9290099698.

The spelling of 66888317 in words is "sixty-six million, eight hundred eighty-eight thousand, three hundred seventeen".