binary system
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There is no THE 80 digit number - there are 9*1079 of them and each one of them has a differen name just as 11 and 12, both 2-digit numbers, have different names.
1234567890
96
Digital electronics devices handle numbers in the form of the binary system. That is, the numbers are represented in base-2, with only two digits. That way, when a digit comes along, it's much easier for the electronic device to decide what digit it is.