66118910873 has 2 divisors, whose sum is σ = 66118910874. Its totient is φ = 66118910872.

The previous prime is 66118910813. The next prime is 66118910909. The reversal of 66118910873 is 37801981166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65113259929 + 1005650944 = 255173^2 + 31712^2 .

It is a cyclic number.

It is not a de Polignac number, because 66118910873 - 2¹⁶ = 66118845337 is a prime.

It is not a weakly prime, because it can be changed into another prime (66118910813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33059455436 + 33059455437.

It is an arithmetic number, because the mean of its divisors is an integer number (33059455437).

Almost surely, 2^66118910873 is an apocalyptic number.

It is an amenable number.

66118910873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66118910873 is an equidigital number, since it uses as much as digits as its factorization.

66118910873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 66118910873 in words is "sixty-six billion, one hundred eighteen million, nine hundred ten thousand, eight hundred seventy-three".