This format is weird -- it represents (effectively) a 65-bit signed integer, which doesn't fit on any current platform sensibly, but also puts a strict upper limit on integer sizes.
EDIT: Found bigints. Still weird having a signed 65-bit integer.
EDIT: Found bigints. Still weird having a signed 65-bit integer.
ioquatix: You might want to edit your post to indicate exponentiation. It took me quite a moment to realize you meant that a signed 64-bit int represented in 2s complement has two-to-the-sixty-fourth values, not two hundred and sixty four. I'm guessing you used two asterisks which HN mistook as a zero-length italics?
If you happen to be on OS X, you can type Control+Command+Space in most contexts, and get a popup that will let you select special characters, like the above, emoji, etc. It even has a decent search box.
If you're on Linux, you can set a key as a Compose key (I use my right alt key); the default set of compose sequences includes superscript six as Compose, ^, 6. You can also input arbitrary unicode into most contexts if the app is using GTK with Ctrl+Shift+u, followed by the hexadecimal code point, followed by space.
On Windows, I have no idea.
[1]: http://www.fileformat.info/info/unicode/char/2076/index.htm