Enter a clue or pattern or both:
The Clue
One followed by 15 zeros (11 letter answer)
The Answer
QUADRILLION
Tags
Notes
The answer QUADRILLION is so rare that it appears less than once every 2500 puzzles.
Definition
QUADRILLION as a noun:
1. the number that is represented as a one followed by 24 zeros; "in England they call a septillion a quadrillion"
2. the number that is represented as a one followed by 15 zeros