545
5 x 109
545 = 5 x 109
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The factor tree for 216 looks like 2 times 108 2 times 54 2 times 27 9 times 3
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
145 5,29 Not much of a tree. More like a factor shrub.