I don't think such a number exists.
If W is your whole number, and N is the number made up only of 9s, then you're looking for W x 5 = N. But any whole number multiplied by 5 can produce only a 0 or 5 in the ones place.
0 x 5 = 0
1 x 5 = 5
2 x 5 = 10
3 x 5 = 15
...
Put it another way, there...