directed numbers can be useful by:
1: money-gain and losses
2: temperature-above and below 0
3: football-gain and lose yardage
4:altitudes-above and below sea levels etc.................
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There is no such actual number. It is a created word for a very large number. As with "googolplex" (10googol), large numbers are only useful for comparing to other very large numbers.
They can help you to find the Lowest Common Multiple and Highest Common Factor of numbers which is useful when dealing with fractions.
Negative numbers exisit because negative numbers are useful to describe values on a scale below zero (0), such as temperature and also book kepping where they can be used to represent credits
That many digits are not known. Even the known digits are so many that it is not practical - nor useful - to list them.
It means they have no common factors. This term is really only useful for integers, preferably positive integers.