How big is a quadrillion ?

A quadrillion is equal to 1000 trillions or 1 million billions. It is also the same as 999 trillions plus 1 trillion.

We write 1 quadrillion in standard form as 1,000,000,000,000,000.

As you can see, it is a 1 followed by 15 zeros.

With an exponent, you can write it as 10¹⁵