What does the notation 0x(something) mean?

I saw 0xB6DB6DB6 used as a mask here.

If I am not wrong, then thats the representation of number in hexadecimal system. I remember coming across them when I was modding some old games for fun.

0x prefix is used to make the compiler aware that you are using a hexadecimal number which is followed by number in hexadecimal format .

You can checkout this link :
http://wiki.osdev.org/Hexadecimal_Notation

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