According to the French and American method of numeration, a thousand millions, or 1,000,000,000; according to the English method, a million millions, or 1,000,000,000,000. See Numeration.
A number represented as a 1 followed by nine zeros (1,000,000,000). If you have a bucket that holds 10 thousand marbles, you would need 100 thousand of those same buckets to hold a billion marbles! That's a lot of marbles