Help me please!

How many digits are in the number 2^2009 × 5^2005?

I've no idea how to begin.

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- August 23rd 2009, 01:06 AM #1

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- August 23rd 2009, 01:31 AM #2

- August 23rd 2009, 02:45 AM #3

- August 23rd 2009, 10:19 AM #4

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