69! - Numberphile

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69 is the largest number that most hand-held calculators can factorialize!
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Professor Laurence Eaves from the University of Nottingham explains.

NUMBERPHILE

Videos by Brady Haran

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I love how they got the most serious guy to do the video on 69

iedison

In this guy's next video, he's going to show us the importance of 58008 on his calculator.

SlyMaelstrom

I laughed so hard when he yelled "N!", that's what my friends would do for sure! XD

ComposingGloves

When a mathematician has exactly the same calculator model as me, a teenager who failed maths:
*You and I are not so different*

-cookiezila-

The only video on the internet titled "69!" that isn't clickbait.

Well played Numberphile, well played.

ihavenolifebutilikeboobsth

these people make me want to become a mathematician just so that i can write on brown rolls of paper with blue markers

JoannaZieba

(0:16) Am I the only one who is fascinated by how perfect he draws the "n"?

tiii

“it turns out this is the largest number i could put on my calcultor”
*oh yeah baby, lets do it*

wikdd

LIES! you actually ARE supposed to shout factorials. the exclamation means you have to get excited and yell it while doing the math.

CoachJohnMcGuirk

I saw 69! in the title and instantly remembers the capabilities of my calculator from school!

ChrisWalshZX

Who else was messing with their calculator and already knew it

yakinthebox

2012: Wow! What a huge number!

2020: nice

dainmeister

I think the following property of 69 is more interesting. It's the only positive integer whose square and cube collectively use each decimal digit exactly once.

69^2 = 4761
69^3 = 328509

gremlinn

So this entire video was just some dude talking about the limitations on his calculator?

traktortarik

We discovered this at school 35 years ago. It was the only function on a scientific calculator that took a noticeable amount of time to complete, so we used it as a benchmark, holding 'factorial races' between models.

handpaper