666313171 has 2 divisors, whose sum is σ = 666313172. Its totient is φ = 666313170.

The previous prime is 666313169. The next prime is 666313177. The reversal of 666313171 is 171313666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666313171 - 2¹ = 666313169 is a prime.

Together with 666313169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (666313177) 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, 333156585 + 333156586.

It is an arithmetic number, because the mean of its divisors is an integer number (333156586).

Almost surely, 2^666313171 is an apocalyptic number.

666313171 is a deficient number, since it is larger than the sum of its proper divisors (1).

666313171 is an equidigital number, since it uses as much as digits as its factorization.

666313171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 666313171 is about 25813.0426528916. The cubic root of 666313171 is about 873.4260339834.

The spelling of 666313171 in words is "six hundred sixty-six million, three hundred thirteen thousand, one hundred seventy-one".