66111497 has 2 divisors, whose sum is σ = 66111498. Its totient is φ = 66111496.

The previous prime is 66111491. The next prime is 66111523. The reversal of 66111497 is 79411166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43349056 + 22762441 = 6584^2 + 4771^2 .

It is a cyclic number.

It is not a de Polignac number, because 66111497 - 2⁶ = 66111433 is a prime.

It is not a weakly prime, because it can be changed into another prime (66111491) 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, 33055748 + 33055749.

It is an arithmetic number, because the mean of its divisors is an integer number (33055749).

Almost surely, 2^66111497 is an apocalyptic number.

It is an amenable number.

66111497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111497 is an equidigital number, since it uses as much as digits as its factorization.

66111497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 66111497 is about 8130.8976749188. The cubic root of 66111497 is about 404.3514427916.

The spelling of 66111497 in words is "sixty-six million, one hundred eleven thousand, four hundred ninety-seven".