What's the biggest number we know
- What's the biggest number we know so far
- What is the biggest planet we know of
- What's the biggest galaxy we know of
- What's the biggest prime number we know
- What is the biggest number we know right now
- What is the biggest perfect number we know
- What's the biggest thing we know of
- What's the biggest sun we know of
- What is the biggest number in the world that we know of