Can you replace the question mark with the correct number?

What does the below rebus riddle means?

What does this mean?

CCCCCCC

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

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

In the four images below, can you find the odd one out?

Solve the following series:
AZ, GT, MN, __, YB

What does this rebus puzzle means ?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.