How can I get the value of the least significant bit in a number?

x &= -x; /* clears all but the lowest bit of x */

A more readable code:

int leastSignificantBit(int number)
{
    int index = 0;

    while ((~number) & 1) {
        number >>= 1;
        index++;
    }
    return 1 << index;
}