The number that is written as 1 followed by 27 zeros.
The word octillion is used in math and big numbers.
Examples:
An octillion is a very big number.
There are more stars in the sky than there are octillions of sand on the beach.
If you had an octillion dollars, you could buy a lot of things.
I have an octillion toys in my room!
There are not octillions of people in the world.
An octillion is a number bigger than a million or a billion.