Answer
6227020800
Work Step by Step
$13! = 13*12*11*10*9*8*7*6*5*4*3*2*1$
$13*12*11*10*9*8*7*6*5*4*3*2*1 = 156 *110*72*42*20*6$
$156 *110*72*42*20*6 = 17160 * 3024 *120$
$ 17160 * 3024 *120 = 6227020800$
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