check digit
Assuming that you mean a digit, it is a terminating decimal.
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
Tenths
1200000000000000000$
one two gazillions
it has 1200000000000000000 babies a week. tmd
check digit
Assuming that you mean a digit, it is a terminating decimal.
What is 36 single digit number
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.
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.
The digit in the ten billions place of the number 198416876543 is 1. In this number, the ten billions place is the fourth digit from the right. Counting from right to left, the digits in this number are in the following order: 3 (ones), 4 (tens), 5 (hundreds), 6 (thousands), 7 (ten thousands), 6 (hundred thousands), 8 (millions), 7 (ten millions), 1 (hundred millions), and finally, 1 in the ten billions place.
Just that - a 26-digit number. There is no special name for that.
Such numbers are best written - and pronounced - in scientific notation. Normally you don't need all the digits, so you can round such a number to an appropriate number of significant digits - for example, 25670000..... Then you express it in scientific notation, in this example, 2.567 x 1025. Edit: I agree entirely with the previous answer but, if you must: The 2-digit name for digits 1-2 followed by "septillion", the 3-digit name for digits 3-5 followed by "sextillion", the 3-digit name for digits 6-8 followed by "quintillion", the 3-digit name for digits 9-11 followed by "quadrillion", the 3-digit name for digits 12-14 followed by "trillion", the 3-digit name for digits 15-17 followed by "billion", the 3-digit name for digits 18-20 followed by "million", the 3-digit name for digits 21-23 followed by "thousand", and the 3-digit name for digits 24-26.