HOW MUCH IS 5 MILLION TERABYTES IN NUMBERS?

One terabyte = 10¹² bytes....so........

5 million * 10¹² =

[5 *10⁶ * 10¹² ] =  5 * 10¹⁸ bytes =   5,000,000,000,000,000,000 bytes

Or, using the US definition of this.....five quintillion bytes-......