166501 has 8 divisors (see below), whose sum is σ = 177408. Its totient is φ = 156000.

The previous prime is 166487. The next prime is 166541. The reversal of 166501 is 105661.

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 166501 - 2¹⁵ = 133733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166541) 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, 1206 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (22176).

2¹⁶⁶⁵⁰¹ is an apocalyptic number.

It is an amenable number.

166501 is a deficient number, since it is larger than the sum of its proper divisors (10907).

166501 is a wasteful number, since it uses less digits than its factorization.

166501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 166501 is about 408.0453406179. The cubic root of 166501 is about 55.0138807940.

The spelling of 166501 in words is "one hundred sixty-six thousand, five hundred one".