166161 has 8 divisors (see below), whose sum is σ = 224224. Its totient is φ = 109440.

The previous prime is 166157. The next prime is 166169. The reversal of 166161 is 161661.

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

It is not a de Polignac number, because 166161 - 2² = 166157 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166161.

It is not an unprimeable number, because it can be changed into a prime (166169) 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, 6 + ... + 576.

It is an arithmetic number, because the mean of its divisors is an integer number (28028).

2¹⁶⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

166161 is a deficient number, since it is larger than the sum of its proper divisors (58063).

166161 is an equidigital number, since it uses as much as digits as its factorization.

166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its digits is 216, while the sum is 21.

The square root of 166161 is about 407.6285073446. The cubic root of 166161 is about 54.9764086151.

The spelling of 166161 in words is "one hundred sixty-six thousand, one hundred sixty-one".