It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66198.
66198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
66198 is a Giuga number.
266198 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 66198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66198 is a wasteful number, since it uses less digits than its factorization.
66198 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 92.
The square root of 66198 is about 257.2897199656. The cubic root of 66198 is about 40.4527722612.
The spelling of 66198 in words is "sixty-six thousand, one hundred ninety-eight".