why number 8549176320 is one of a kind?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What time is it when an elephant sits on a fence?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

How many letters are in the alphabet?