166187 has 4 divisors (see below), whose sum is σ = 189936. Its totient is φ = 142440.

The previous prime is 166183. The next prime is 166189. The reversal of 166187 is 781661.

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

It is a cyclic number.

It is not a de Polignac number, because 166187 - 2² = 166183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166183) 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, 11864 + ... + 11877.

It is an arithmetic number, because the mean of its divisors is an integer number (47484).

2¹⁶⁶¹⁸⁷ is an apocalyptic number.

166187 is a deficient number, since it is larger than the sum of its proper divisors (23749).

166187 is an equidigital number, since it uses as much as digits as its factorization.

166187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23748.

The product of its digits is 2016, while the sum is 29.

The square root of 166187 is about 407.6603978804. The cubic root of 166187 is about 54.9792759387.

It can be divided in two parts, 166 and 187, that added together give a palindrome (353).

The spelling of 166187 in words is "one hundred sixty-six thousand, one hundred eighty-seven".