166143 has 4 divisors (see below), whose sum is σ = 221528. Its totient is φ = 110760.

The previous prime is 166099. The next prime is 166147. The reversal of 166143 is 341661.

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

It is not a de Polignac number, because 166143 - 2⁸ = 165887 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27688 + ... + 27693.

It is an arithmetic number, because the mean of its divisors is an integer number (55382).

2¹⁶⁶¹⁴³ is an apocalyptic number.

166143 is a deficient number, since it is larger than the sum of its proper divisors (55385).

166143 is an equidigital number, since it uses as much as digits as its factorization.

166143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55384.

The product of its digits is 432, while the sum is 21.

The square root of 166143 is about 407.6064278198. The cubic root of 166143 is about 54.9744233697.

The spelling of 166143 in words is "one hundred sixty-six thousand, one hundred forty-three".