66543 has 8 divisors (see below), whose sum is σ = 91056. Its totient is φ = 43200.

The previous prime is 66541. The next prime is 66553. The reversal of 66543 is 34566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66543 - 2¹ = 66541 is a prime.

66543 is a lucky number.

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66541) 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, 148 + ... + 393.

It is an arithmetic number, because the mean of its divisors is an integer number (11382).

2⁶⁶⁵⁴³ is an apocalyptic number.

66543 is a deficient number, since it is larger than the sum of its proper divisors (24513).

66543 is a wasteful number, since it uses less digits than its factorization.

66543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

The product of its digits is 2160, while the sum is 24.

The square root of 66543 is about 257.9592991152. The cubic root of 66543 is about 40.5229255966.

The spelling of 66543 in words is "sixty-six thousand, five hundred forty-three".