66911018117 has 2 divisors, whose sum is σ = 66911018118. Its totient is φ = 66911018116.

The previous prime is 66911018033. The next prime is 66911018137. The reversal of 66911018117 is 71181011966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63005518081 + 3905500036 = 251009^2 + 62494^2 .

It is a cyclic number.

It is not a de Polignac number, because 66911018117 - 2¹⁰ = 66911017093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66911018137) 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, 33455509058 + 33455509059.

It is an arithmetic number, because the mean of its divisors is an integer number (33455509059).

Almost surely, 2^66911018117 is an apocalyptic number.

It is an amenable number.

66911018117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66911018117 is an equidigital number, since it uses as much as digits as its factorization.

66911018117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 66911018117 in words is "sixty-six billion, nine hundred eleven million, eighteen thousand, one hundred seventeen".