543666 has 24 divisors (see below), whose sum is σ = 1152144. Its totient is φ = 171000.

The previous prime is 543661. The next prime is 543671. The reversal of 543666 is 666345.

It is an interprime number because it is at equal distance from previous prime (543661) and next prime (543671).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 543666.

It is not an unprimeable number, because it can be changed into a prime (543661) by changing a digit.

543666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2041 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (48006).

2⁵⁴³⁶⁶⁶ is an apocalyptic number.

543666 is an abundant number, since it is smaller than the sum of its proper divisors (608478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

543666 is a wasteful number, since it uses less digits than its factorization.

543666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 275 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 543666 is about 737.3371006534. The cubic root of 543666 is about 81.6163918435.

The spelling of 543666 in words is "five hundred forty-three thousand, six hundred sixty-six".