**1914**

Lets find out how zero's formed:

5!- 1 zero,

10!- 2 zero's

90!- 2*9=18 zero's

95!- 19 zero's

100!- 19+2=21 zero's

900!- 21*9=189 zero's

995!- 189+19=208 zeros

1000!- 208+3=211 zero's

9000!- 211*9=1899 zero's

Now we need 2018-1899=119 which we can get from 5*21+7*2 which is 570, so total is 9570! will give us 2018 zero's

5n = 9570 => **n = 1914**