Wiki User
∙ 2014-07-02 01:02:0231
Wiki User
∙ 2014-07-02 01:02:02I'm sure there are more than 2 prime numbers that are 400 digits long.
If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .If the same digit can't be used more than once, then the largest possible number has only10 digits. The number is 9,876,543,210 .
The number is 84.
We call them by the number of their digits. Two-digit number, three-digit number and so on.
There is no specific name: you just call it a number with 2 or more digits or a multi-digit number.
50
We generally refer to them by the number of digits. Two-digit number, three-digit number, etc.
A quintillion is a number with 18 zeros (19 digits). A 20-digit number would be 10's of a quintillion (20 digits since we add one more digit to the left).
17
Every square of a 4 digit number has more than four digits.
2.3
45 and 54