#### Answer

$6,227,020,800$

#### Work Step by Step

Expand the factorial: $13! = 13 \times 12 \times 11 \times 10 \times 9 \times 8\times 7 \times 6\times 5\times 4 \times 3 \times2 \times 1$
Caclulating: $13 \times 12 \times 11 \times 10 \times 9 \times 8\times 7 \times 6\times 5\times 4 \times 3 \times2 \times 1 = 6227020800 $