why number 8549176320 is one of a kind?

What do you think with the below Picture ?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does a man do only once in his lifetime, but women do once a year after they are 29?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

What is the centre of gravity?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

There is a place where if I stand up straight, I will still be considered sideways.