Numbers and fingers are both called digits.
Digit. A digit is a single symbol used to make numerals. 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are the ten digits we use in everyday numerals. Example: The numeral 153 is made up of 3 digits ("1", "5" and "3"). Example: The numeral 46 is made up of 2 digits ("4", and "6").
The tens digit.
tenth thousand
The value of a digit in a number is called its place value.
In any two-digit multiplication sum, for example, 3 x 2 = 6, the first digit is called the multiplier, the second digit is called a multiplicand, and the third digit, the answer, is the product.
digit
The tens digit.
If your asking in a digit it's called a 4 digit number and it is the smallest 4 digit number
It is called a 28-digit number!
tenth thousand
It is called a twelve-digit number. Its exact name will depend on the number.
A 22 digit number is called a quintillion.
The value of a digit in a number is called its place value.
In any two-digit multiplication sum, for example, 3 x 2 = 6, the first digit is called the multiplier, the second digit is called a multiplicand, and the third digit, the answer, is the product.
Bit
digit
Just that - a 26-digit number. There is no special name for that.
Calling it "17-digit number" is just fine.