**How many zeros are there in a quadrillion?**

**15.**

The number 1 quadrillion has 15 zeros. Written in numerical notation, 1 quadrillion is equivalent to 1,000,000,000,000,000.Ã‚ It is also sometimes called one thousand trillion and is written in scientific notation as 1Ãƒâ€”10^{15} or just 10^{15}. The word billion comes from the 16^{th} Century French word *quadrillion *which referred to ‘Ëœquadri (‘Å“four’) + (m)illion’â„¢.

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