One quadrillion.
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I write 1000000000000000 (1015) as:One thousand billion; orOne billiardas I use the long scale (as used in Europe).Others write it asOne quadrillionas they use the short scale (as used in USA).
1000,000,000,000,000 is one Billiard
1000000000000000 x 7.2 = 7200000000000000
1 billion = 1000000000 1 million = 1000000 So a million billion is 1000000000000000
1,000,000,000,000x1,000 = 1000000000000000