What is a quadrillion?

Answer 1

Quadrillion may mean either of the two numbers (depends on long and short scales):

• 1,000,000,000,000,000 (one thousand million million; 1015; SI prefix peta) - increasingly common meaning in English language usage.
• 1,000,000,000,000,000,000,000,000 (1024; SI prefix yotta) - increasingly rare meaning in English language usage.

  It is 1,000,000,000,000,000.

• Simply put, in the English language, it is "one thousand trillion."