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Even Exacter Number
A more nearly exact number for the denominator of that tiny number has been calculated for me by Dave L. Renfro: This is a big damn number. Here are the instructions, with thanks to mensanator and Keith Kingsbury, for writing it out longhand:
If someone hires you to complete that task, you will not have to worry about losing your job for quite a little while. If you could write one digit per second for 40 hours a week  no breaks to shake off writer's cramp  it would take you nearly 30 centuries and a lot of pencils. 22,497,311,902 digits / 3600 seconds per hour = 6,249,253.30611 hours 6,249,253.30611 hours / 40 hours per week = 156,231.332653 40hour weeks (Number of weeks per year = 365.25 days / 7 days per week = 52.1785714286 weeks) Number of years = 156,231.332653 40hour weeks / 52.1785714286 weeks per year = 2,994.16653955 years. And a lot of paper too. Assuming a piece of paper is .003 inches thick, if you could write 5,000 legible digits on one sheet  which you can't  the stack of pages needed to write out this number would be 1,125 feet tall. 22,497,311,902 digits / 5,000 digits per page = 4,499,462.3804 pages 4,499,462.3804 pages X 0.003 inches per page = 13,498.3871412 inches of pages 13,498.3871412 inches / 12 inches per foot = 1,124.8655951 feet of pages. If you could write 10 digits in an inch  which you can't  that number would stretch over 35,000 miles. 22,497,311,902 digits / 10 digits per inch = 2,249,731,190.2 inches 2,249,731,190.2 inches / 12 inches per foot = 187,477,599.183 feet 187,477,599.183 feet / 5,280 feet per mile = 35,507.1210574 miles. All said, no matter how you look at it, it's a big damn number, yet it's one that you can apprehend if you imagine all 3 billion of us north of the Equator jumping off our chairs at the same randomly chosen moment for no particular reason. And despite how extraordinarily unlikely it is that we would all do that, you have conceived it yet again, so I say again that it's not inconceivable. It's fun to try to imagine that which is truly inconceivable and nontrivial. Earlier I said I cannot conceive that time is not infinite in both directions, and I will add that I think it inconceivable that space is finite. Please what you think is inconceivable.

Even bigger numbers On the previous page akprasad referred to some unusual names for counting numbers as well as to a special one, a googolplex. Googol To start with, a "mere" googol is 10 raised to the power of 100, or a 1 followed by 100 zeros. In math terms it would be 10^100, meaning 10 times 10 times 10 and so on for a hundred such multiplications. The result is a number with 101 digits. Written out in full a googol looks like this: 10,000,000,000,000,000, (In case you're wondering, the sillysounding name came from the nineyearold nephew of American mathematician Edward Kasner, who "invented" the number and coined it in 1938.) By contrast, the number at left contains not just a hundred zeros but 22 billion of them. A googol, with its mere hundred zeros, is as nothing compared to the number at left. The number at left divided by a googol is, for all practical purposes, the same number. Googolplex But the number at left is as nothing compared to a googolplex. A googolplex is 10 raised to the power of a googol, or a 1 followed by a googol of zeros! A googolplex is so large a number that you (well, I, anyway) can't conceive it without referring to a googol, itself an
impossibly large number. And if you think a googolplex is about as big a number as one would ever need, it's not. Much, much BIGGER numbers have been defined. They have literally no practical purpose, but they're fun to think about. I have convinced my eightyearold there's an interesting difference between her brain and a vessel such as, say, a coffee cup. The more you try to fill a coffee cup, the less room there is for more. The more you try to fill a brain, the more room there is for more. I've also convinced her, I think, that books make her brain bigger and TV shrinks it. 
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