165990171 has 8 divisors (see below), whose sum is σ = 228952080. Its totient is φ = 106844192.

The previous prime is 165990157. The next prime is 165990179. The reversal of 165990171 is 171099561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165990171 - 2¹⁰ = 165989147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165990179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953880 + ... + 954053.

It is an arithmetic number, because the mean of its divisors is an integer number (28619010).

Almost surely, 2^165990171 is an apocalyptic number.

165990171 is a deficient number, since it is larger than the sum of its proper divisors (62961909).

165990171 is a wasteful number, since it uses less digits than its factorization.

165990171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907965.

The product of its (nonzero) digits is 17010, while the sum is 39.

The square root of 165990171 is about 12883.7172819028. The cubic root of 165990171 is about 549.5756186360.

The spelling of 165990171 in words is "one hundred sixty-five million, nine hundred ninety thousand, one hundred seventy-one".