This is a machine independent signed integer value that is represented internally by a 64 bit value. The valid range is from -2^63 through 2^63-1. Integer constants are written just as you would expect. You can write them either decimal or hexadecimal by prefixing them with 0x, or octal by prefixing them with 0 (just like in C/C++).

1
-17049349
0x9fa0
0xDEADBEEF
0233