166243 has 16 divisors (see below), whose sum is σ = 221184. Its totient is φ = 120960.

The previous prime is 166237. The next prime is 166247. The reversal of 166243 is 342661.

It is not a de Polignac number, because 166243 - 2¹⁷ = 35171 is a prime.

It is an Ulam number.

It is a Duffinian number.

166243 is a Rhonda number in base 16.

It is not an unprimeable number, because it can be changed into a prime (166247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (13824).

2¹⁶⁶²⁴³ is an apocalyptic number.

166243 is a deficient number, since it is larger than the sum of its proper divisors (54941).

166243 is a wasteful number, since it uses less digits than its factorization.

166243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 864, while the sum is 22.

The square root of 166243 is about 407.7290767164. The cubic root of 166243 is about 54.9854506970.

The spelling of 166243 in words is "one hundred sixty-six thousand, two hundred forty-three".