"Drillion" does not appear in either the American or the British system of numeration for denominations up to 10600. The closest name on either list is the "trillion", meaning '1' followed by 12 zeros (American) or 18 zeros (British). The next designation is "quadrillion". In the American system, '1' with 15 zeros. In the British system, '1' with 24 zeros.
there are 15 zeroes
There are 15 zeros in a quadrillion. 1,000,000,000,000,000
1 x 10^91 10,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000,000,000,000 has thirty sets of 000's. On the European long scale, it is ten quindecillion. On the US (short scale), it is ten novemvigintillion.