The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
Since 195 is a single number, you could say that it shares all of its factors with itself. So the greatest factor of 195 is 195
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330, 495, 660, and so on. A multiple is a number that the original number (165) divides evenly into.
Infinite. The first 10 are:
195, 390, 585, 780, 975, 1170, 1365, 1560, 1755, 1950 . . .
165 has eight divisors: 1 3 5 11 15 33 55 165.
330, 660, 990 and so on.
It is a requirement to list 33 multiples of some, as-yet-unspecified, number.
110, 121, 132, 143, 154, 165, 176, 187, 198.
Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195