Find the next number in the series below? 6; 18; 270; 72090; ?

Answer 1

6 ----- 18 ===> 6*(6-3) = 6*3 = 18
18 ----- 270 ===> 18*(18-3) = 18*15 = 270
270 ----- 72,090 ===> 270*(270-3) = 270*267 = 72090
72090 ----- 5,196,751,830 ===> 72090*(72090-3) = 72090*72087 = 5,196,751,830.