What is the largest possible number you can write using only 2 numbers - just 2 numbers, no other mathematical symbols?

Why this works

This riddle plays on the idea of constructing the largest number using only two digits: 9 and 9. While it seems straightforward to write "99" as the largest two-digit number, it cleverly allows for a deeper interpretation by considering repeated multiplication of the digits. Here, "9" can be treated as a base in exponentiation; thus, 9 multiplied by itself repeatedly (9^9) results in the much larger number 387,420,489. The trick lies in realizing that the riddle invites you to think beyond simple concatenation and into the realm of exponential growth!