66221107171 has 2 divisors, whose sum is σ = 66221107172. Its totient is φ = 66221107170.

The previous prime is 66221107123. The next prime is 66221107193. The reversal of 66221107171 is 17170112266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66221107171 - 2¹⁷ = 66220976099 is a prime.

It is not a weakly prime, because it can be changed into another prime (66221107871) 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, 33110553585 + 33110553586.

It is an arithmetic number, because the mean of its divisors is an integer number (33110553586).

Almost surely, 2^66221107171 is an apocalyptic number.

66221107171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66221107171 is an equidigital number, since it uses as much as digits as its factorization.

66221107171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The spelling of 66221107171 in words is "sixty-six billion, two hundred twenty-one million, one hundred seven thousand, one hundred seventy-one".