66221867863 has 2 divisors, whose sum is σ = 66221867864. Its totient is φ = 66221867862.

The previous prime is 66221867857. The next prime is 66221867867. The reversal of 66221867863 is 36876812266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66221867863 - 2⁹ = 66221867351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66221867867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33110933931 + 33110933932.

It is an arithmetic number, because the mean of its divisors is an integer number (33110933932).

Almost surely, 2^66221867863 is an apocalyptic number.

66221867863 is a deficient number, since it is larger than the sum of its proper divisors (1).

66221867863 is an equidigital number, since it uses as much as digits as its factorization.

66221867863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 55.

The spelling of 66221867863 in words is "sixty-six billion, two hundred twenty-one million, eight hundred sixty-seven thousand, eight hundred sixty-three".