Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
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However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

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Amazing Facts

Word ladder puzzle

The word ladder puzzle was invented by Lewis Carroll, author of Alice’s Adventures in Wonderland.