66435217 has 2 divisors, whose sum is σ = 66435218. Its totient is φ = 66435216.

The previous prime is 66435181. The next prime is 66435221. The reversal of 66435217 is 71253466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41525136 + 24910081 = 6444^2 + 4991^2 .

It is a cyclic number.

It is not a de Polignac number, because 66435217 - 2²³ = 58046609 is a prime.

It is not a weakly prime, because it can be changed into another prime (66435227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33217608 + 33217609.

It is an arithmetic number, because the mean of its divisors is an integer number (33217609).

Almost surely, 2^66435217 is an apocalyptic number.

It is an amenable number.

66435217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66435217 is an equidigital number, since it uses as much as digits as its factorization.

66435217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 66435217 is about 8150.7801467099. The cubic root of 66435217 is about 405.0103477517.

The spelling of 66435217 in words is "sixty-six million, four hundred thirty-five thousand, two hundred seventeen".