2*2+156678*77*99

Let's calculate the expression step by step:

1. First, calculate \(2 \times 2\): \[ 2 \times 2 = 4 \]

2. Next, calculate \(156678 \times 77 \times 99\):

   • First, calculate \(156678 \times 77\): \[ 156678 \times 77 = 12065286 \]
   • Now, multiply that result by \(99\): \[ 12065286 \times 99 = 1194462864 \]

3. Now, add the results from step 1 and step 2: \[ 4 + 1194462864 = 1194462868 \]

Thus, the final result of the expression \(2 \times 2 + 156678 \times 77 \times 99\) is: \[ \boxed{1194462868} \]