166668518267 has 2 divisors, whose sum is σ = 166668518268. Its totient is φ = 166668518266.

The previous prime is 166668518243. The next prime is 166668518287. The reversal of 166668518267 is 762815866661.

It is a strong prime.

It is an emirp because it is prime and its reverse (762815866661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166668518267 - 2²⁸ = 166400082811 is a prime.

It is not a weakly prime, because it can be changed into another prime (166668518287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334259133 + 83334259134.

It is an arithmetic number, because the mean of its divisors is an integer number (83334259134).

Almost surely, 2^166668518267 is an apocalyptic number.

166668518267 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668518267 is an equidigital number, since it uses as much as digits as its factorization.

166668518267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 62.

The spelling of 166668518267 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred eighteen thousand, two hundred sixty-seven".