quadrillion

It's a little time consuming to write out the number one quadrillion, since it's a one and fifteen zeros.

It's probably a good time to brush up on big numbers, now that billions and even trillions are bandied about as if they were mere dozens. A quadrillion is one followed by fifteen zeroes. If you're looking for a mnemonic, the root word, quad, "four" from the Latin quadri, refers to the number of groups of three zeroes that follow one thousand.

Definitions of quadrillion
  1. noun
    the number that is represented as a one followed by 15 zeros
    see moresee less
    type of:
    large integer
    an integer equal to or greater than ten
  2. noun
    the number that is represented as a one followed by 24 zeros
    “in England they call a septillion a quadrillion
    see moresee less
    type of:
    large integer
    an integer equal to or greater than ten
Word Family