660171 has 4 divisors (see below), whose sum is σ = 880232. Its totient is φ = 440112.

The previous prime is 660167. The next prime is 660181. The reversal of 660171 is 171066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 660171 - 2² = 660167 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110026 + ... + 110031.

It is an arithmetic number, because the mean of its divisors is an integer number (220058).

2⁶⁶⁰¹⁷¹ is an apocalyptic number.

660171 is a deficient number, since it is larger than the sum of its proper divisors (220061).

660171 is a wasteful number, since it uses less digits than its factorization.

660171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220060.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 660171 is about 812.5090768724. The cubic root of 660171 is about 87.0733955882.

The spelling of 660171 in words is "six hundred sixty thousand, one hundred seventy-one".