165571022171 has 2 divisors, whose sum is σ = 165571022172. Its totient is φ = 165571022170.

The previous prime is 165571022161. The next prime is 165571022179. The reversal of 165571022171 is 171220175561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165571022171 is a prime.

It is not a weakly prime, because it can be changed into another prime (165571022179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82785511085 + 82785511086.

It is an arithmetic number, because the mean of its divisors is an integer number (82785511086).

Almost surely, 2^165571022171 is an apocalyptic number.

165571022171 is a deficient number, since it is larger than the sum of its proper divisors (1).

165571022171 is an equidigital number, since it uses as much as digits as its factorization.

165571022171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 38.

The spelling of 165571022171 in words is "one hundred sixty-five billion, five hundred seventy-one million, twenty-two thousand, one hundred seventy-one".