Expression for animating text on tight spiral

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I created a spiral in Illustrator because it is easy, copied and pasted it as a mask path on a text layer, then used this page to generate 2000 random numbers from 1 to 1000, then copied them and pasted them to the text layer and added an opacity animator. The string was so much longer than the path that I added a bunch more points and ended up with this:

Here's the project file for you to look at. I think you have a bigger problem with your expression than you do with the idea and the capability of the text layer to contain enough characters. 

Thanks for the replies.

It seems that no matter how many digits are in the source text, After Effects will scroll up to 466 of them on to the spiral before they disappear. I don't know if this is due to my hardware set-up or not.

This happens with force align and also other text in animators being used instead of the expression.

I'll do what Mylenium suggested and break the animation into segments.

I would have used a text animator instead of a random number expression. You are just running out of available characters before you get to the end of the path. You are also adding 3 characters per frame. Do you need that kind of speed. Nobody is going to be able to read it, so concentrate on the look instead of the actual numbers.

Have you tried selecting "Force Alignment" under the Path Options inside the Text Property group?

There are intrinsic limits in JavaScript math like it's implemented in AE like the number of characters in a string or integer numbers capping off at 32000. The usual limits AE has as a whole. You need to split up your work into manageable segments instead of just firing the data at the expression. Should not be an issue, as clearly not all characters would be visible at all times, anyway.

Mylenium