668450171 has 2 divisors, whose sum is σ = 668450172. Its totient is φ = 668450170.

The previous prime is 668450143. The next prime is 668450201. The reversal of 668450171 is 171054866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668450171 is a prime.

It is a super-2 number, since 2×668450171² = 893651262219858482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668450071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334225085 + 334225086.

It is an arithmetic number, because the mean of its divisors is an integer number (334225086).

Almost surely, 2^668450171 is an apocalyptic number.

668450171 is a deficient number, since it is larger than the sum of its proper divisors (1).

668450171 is an equidigital number, since it uses as much as digits as its factorization.

668450171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 668450171 is about 25854.4033193574. The cubic root of 668450171 is about 874.3587883488.

The spelling of 668450171 in words is "six hundred sixty-eight million, four hundred fifty thousand, one hundred seventy-one".