Quintillion, which is what next year's proposed budget will be. ;)Hmm:I thought it would be quaddrillion and one. =-]
One quadrillion = 1,000,000,000,000,000 = 1 × 1015, thus 15 zeros.
One candidate for the hardest number to say is "septillion," which is a 1 followed by 24 zeros. This number can be challenging to articulate due to its length and complexity.
Oh, dude, that's a big number! The word form for 400000000000000000000000000 is "four hundred quintillion." So, like, if you ever need to impress someone with a ridiculously large number, now you know what to say.