166502905171 has 2 divisors, whose sum is σ = 166502905172. Its totient is φ = 166502905170.

The previous prime is 166502905139. The next prime is 166502905183. The reversal of 166502905171 is 171509205661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166502905171 - 2⁵ = 166502905139 is a prime.

It is not a weakly prime, because it can be changed into another prime (166502905271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83251452585 + 83251452586.

It is an arithmetic number, because the mean of its divisors is an integer number (83251452586).

Almost surely, 2^166502905171 is an apocalyptic number.

166502905171 is a deficient number, since it is larger than the sum of its proper divisors (1).

166502905171 is an equidigital number, since it uses as much as digits as its factorization.

166502905171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 166502905171 in words is "one hundred sixty-six billion, five hundred two million, nine hundred five thousand, one hundred seventy-one".