It is a sphenic number, since it is the product of 3 distinct primes.
It is a Curzon number.
It is a plaindrome in base 9 and base 15.
It is a nialpdrome in base 10.
66554 is a Friedman number, since it can be written as 65*4^5-6, using all its digits and the basic arithmetic operations.
266554 is an apocalyptic number.
66554 is a wasteful number, since it uses less digits than its factorization.
66554 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 420.
The square root of 66554 is about 257.9806194271. The cubic root of 66554 is about 40.5251583765.
The spelling of 66554 in words is "sixty-six thousand, five hundred fifty-four".