166543 has 8 divisors (see below), whose sum is σ = 187488. Its totient is φ = 146784.

The previous prime is 166541. The next prime is 166561. The reversal of 166543 is 345661.

166543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166543 - 2¹ = 166541 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

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, 21 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (23436).

2¹⁶⁶⁵⁴³ is an apocalyptic number.

166543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166543 is a deficient number, since it is larger than the sum of its proper divisors (20945).

166543 is a wasteful number, since it uses less digits than its factorization.

166543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its digits is 2160, while the sum is 25.

The square root of 166543 is about 408.0968022418. The cubic root of 166543 is about 55.0185061691.

The spelling of 166543 in words is "one hundred sixty-six thousand, five hundred forty-three".