check digit
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
binary system
The prime number between 20 and 30 whose ones digit is 7 greater than its tens digit is 23. The tens digit is 2, and the ones digit is 3, which is 7 greater than 2. Additionally, 23 is a prime number because it is only divisible by 1 and itself, with no other factors.
two- digit modifier
Modifier
Modifier
two- digit modifier
Modifier
Code on an integrated circuit includes four common sections: the manufacturer's name or logo, the part number, a part production batch number, and a four-digit code that identifies when the chip was manufactured. The manufacturing date is commonly represented as a two-digit year followed by a two-digit week code.
A credit card's security code, generally a 3 digit number, is located on the opposite side of the card from the actual credit card number and expiry date. On my cards, the security code is a rather small number just to the right of where you sign your name.
What is 36 single digit number
We generally refer to them by the number of digits. Two-digit number, three-digit number, etc.
A 24-digit number is called a septillion, as it consists of 24 individual numerical digits. In the context of computing, a 24-digit number can also be referred to as a "double precision" floating-point number, typically used to represent very large or very small values with high precision. In mathematics, a 24-digit number can be used to express extremely large quantities or precise measurements.
Just that - a 26-digit number. There is no special name for that.
digit