165740171 has 2 divisors, whose sum is σ = 165740172. Its totient is φ = 165740170.

The previous prime is 165740153. The next prime is 165740177. The reversal of 165740171 is 171047561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165740171 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (165740177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82870085 + 82870086.

It is an arithmetic number, because the mean of its divisors is an integer number (82870086).

Almost surely, 2^165740171 is an apocalyptic number.

165740171 is a deficient number, since it is larger than the sum of its proper divisors (1).

165740171 is an equidigital number, since it uses as much as digits as its factorization.

165740171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 165740171 is about 12874.0114571955. The cubic root of 165740171 is about 549.2995722924.

The spelling of 165740171 in words is "one hundred sixty-five million, seven hundred forty thousand, one hundred seventy-one".