a question about ￡30 adwords vouchers

I recently get a ï¿¡30 adwords voucher, the code looks like:8.7654E+11.
who can tell me whether it is valid?

 

somebody told me a valid code should consist of numbers only.

 

The valid adwords voucher is a number if 12 digits
never see something else.

 

thanks for replying

 

never seen like this ..