How to find value beyond 4 byte limit?

If a game's values were to be 4b*8 and you wanted to find/change a value beyond that 4 byte limit how would you go about doing it?

So for example the value of my something is 500 million. How would I find that value?

Here's the ranges for the different types. Try scanning float or double.

Byte (values between 0 and 255 or -128 to 127 if signed)
2 byte (values between 0 and 65536 or -32768 to 32767 if signed)
4 byte (values between 0 and 4294967295 or -2147483648 and 2147483647 if signed)
8 byte (values between 0 and 18446744073709551614 or -9223372036854775808 and 9223372036854775807 if signed)
Float (values between 1.5 x 10^-45 and 3.4 x 10^38 )
Double (values between 5.0 x 10^-324 and 1.7 x 10^308 )