864
16 x 54
(4x4) x (6x9)
((2x2) x (2x2)) x ((2x3) x (3x3))
Since both 2 and 3 are prime numbers, the factor tree is complete.
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(864,1)(432,2)(288,3)(216,4)(144,6)(108,8)(96,9)(72,12)(54,16)(48,18)(36,24)(32,27)
Keep dividing by two and three.
1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, 32, 36, 48, 54, 72, 96, 108, 144, 216, 288, 432, 864
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.
The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.