why number 8549176320 is one of a kind?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

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

What does Alexander the Great and Winnie the Pooh have in common?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

You need to arrange three 7 and mathematical symbols to form number 1?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.