847
121,7
11,11,7
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Well you should probably make a tree. So first you have to find out at least the smallest number that goes into 847. 847 goes into 7, which is the smallest, yes. 847 divided by 7 equals 121. 121 goes into nothing only 1. So I think that the prime factor would be 847 and I don't know about the other prime factors. Let me check hold on. Yep that is it. Only 121. Just try to make a tree they help out the best, I think anyway. =)
The greatest common factor of 66 and 847 is 11.
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.