A very big number!
In Europe an 18 digit number is in the trillions.
In the US an 18 digit number is in the quintillions.
Lots of room for misunderstanding here, best to use scientific notation!
Eighteen of them from 9 to 98
I suggest you just call it that - a "35-digit number".
The value of a digit in a number is called its place value.
digit
a long number
Eighteen
There are eighteen of them.
It is called a 28-digit number!
It is called a twelve-digit number. Its exact name will depend on the number.
Eighteen of them from 9 to 98
Well, isn't that a happy little question! You can say a 22-digit number by breaking it down into smaller groups, like pairs or fours, to make it easier to remember and say out loud. Just take your time, enjoy the process, and remember, there are no mistakes, only happy little accents in numbers.
I suggest you just call it that - a "35-digit number".
Well, honey, a 400-digit number is simply called a 400-digit number. There's no fancy term for it, just like how there's no need for fancy words to describe a long line at the DMV. Just call it like it is and move on with your day.
The value of a digit in a number is called its place value.
We generally refer to them by the number of digits. Two-digit number, three-digit number, etc.
A 1000-digit number is called a "millidigit" number. The prefix "milli-" denotes one thousandth, so a millidigit number is a number consisting of 1000 digits. In the realm of mathematics, such large numbers are often encountered in fields like cryptography, number theory, and computer science.
Just that - a 26-digit number. There is no special name for that.