666602171 has 2 divisors, whose sum is σ = 666602172. Its totient is φ = 666602170.

The previous prime is 666602117. The next prime is 666602219. The reversal of 666602171 is 171206666.

Together with previous prime (666602117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666602171 - 2⁶ = 666602107 is a prime.

It is not a weakly prime, because it can be changed into another prime (666602771) 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, 333301085 + 333301086.

It is an arithmetic number, because the mean of its divisors is an integer number (333301086).

Almost surely, 2^666602171 is an apocalyptic number.

666602171 is a deficient number, since it is larger than the sum of its proper divisors (1).

666602171 is an equidigital number, since it uses as much as digits as its factorization.

666602171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 666602171 is about 25818.6399912931. The cubic root of 666602171 is about 873.5522927506.

The spelling of 666602171 in words is "six hundred sixty-six million, six hundred two thousand, one hundred seventy-one".