Not with the number effect. The best way is to use an expression. Create a text layer (Cntl+Alt+Shift+T) and add a Effect>Expression Control>Slider Control to it. Twirl open your text layer, and twirl open "Source Text" and add this expression(courtesy Dan Ebberts).
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.