Classic Puzzles - Alphabet Numbers

The Puzzle:

Given only one of each letter in the alphabet, what are
the smallest and largest numbers that you could write down?

 

Help: You can't use the same letter twice, so million, trillion, and googol are all out. Answer below.

 

 

 

 

 

 

Puzzle Author: Stephen Froggatt
Using only one of each letter in the alphabet, you can spell:
ZERO or NOUGHT
MINUS FORTY (allowing negative numbers)
FIVE THOUSAND