[1] http://www.energystar.gov/ia/home_improvement/HPwES_Utility_Intro_FactSheet.pdf. [2] http://www.homestarcoalition.org/about.html. [3] http://www.mckinsey.com/clientservice/electricpowernaturalgas/US_energy_efficiency/. There are no classes in ALL, ALL for WAP.
The biggest/largest integer that can be stored in a double without losing precision is the same as the largest possible value of a double. That is, DBL_MAX or approximately 1.8 Ã 10 308 (if your double is an IEEE 754 64-bit double). It's an integer. It's represented exactly.
In languages like C and FORTRAN (where a double is called double precision), a double is typically understood to have twice the number of bits as a float. This isn't always true, although a double will always have at least as many bits of precision as a float in any sane implementation.