Can you find out which number multiplied by itself will give the output as 12345678987654321?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

If your uncle’s sister is not your aunt, what relation is she to you?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

How do you go from 98 to 720 using just one letter?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?