What is the next number of the following sequence 27, 54, 81, 135, 189, ?

Answer 1

0+27=27+27=54+27=81
81+54=135+54=189+54=243
So the answer is 243

Answer 2

27 is multiplied by prime numbers 1,2,3,5 and 7 in that order. so the next number is 27*11=297