With the help clues provided in the image, can you find the 5 digit key?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

why number 8549176320 is one of a kind?

Who can jump higher than a Mountain?

It belongs to you, but other people use it more than you do. What is it?

What makes this number unique: 8,549,176,320?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

I look at you, you look at me I raise my right, you raise your left. What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?