Dim Value As LongLong
A LongLong is a signed 64 bit data type and is only available in 64 bit applications. It is not available in 32 bit applications running on 64 bit operating systems. It can store integer values in the range of -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 and attempting to store a value outside of that range will result in runtime error 6: Overflow.
The LongLong data type was introduced as part of VBA's 64 bit operating system support. In 64 bit applications, this value can be used to store and pass pointers to 64 bit APIs.
The casting function to convert to a LongLong is
CLngLng(). For casts from floating point types, the result is rounded to the nearest integer value with .5 rounding up.