289,000,000,000. 9 zeros
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There are no zeros on the end of (my) visa card.
1000,000 with another 10000000000 zeros on the end.
Confusingly there are two types of billion. Long and short. In Britain, a billion used to be a million million 1012 whilst in the US a billion was a thousand million 109. (Probably so there could be more billionaires). Since globalisation, the short form has become the standard, so there are 9 zeros in a billion.
At least five. If you want to, you can write a decimal point at the end of the number, and then add as many zeroes as you want after the decimal point. They won't change the value of the number.
Two!