JDK 8u144
=========
exponent = 500
time is 0.004838
total is 21474836470000000
time is 0.004555
total is 21474836470000000
time is 0.001197
total is 21474836470000000
time is 0.001257
total is 21474836470000000
time is 0.001419
total is 21474836470000000
time is 0.001319
total is 21474836470000000
time is 0.001270
total is 21474836470000000
time is 0.001270
total is 21474836470000000
time is 0.001261
total is 21474836470000000
time is 0.001262
total is 21474836470000000
time is 0.001303
total is 21474836470000000
exponent = 800
time is 0.218941
total is 21474836470000000
time is 0.222912
total is 21474836470000000
time is 0.032604
total is 21474836470000000
time is 0.031032
total is 21474836470000000
time is 0.030064
total is 21474836470000000
time is 0.042201
total is 21474836470000000
time is 0.041038
total is 21474836470000000
time is 0.041307
total is 21474836470000000
time is 0.042691
total is 21474836470000000
time is 0.041285
total is 21474836470000000
time is 0.042435
total is 21474836470000000
exponent = 1000
time is 0.281175
total is 21474836470000000
time is 0.247480
total is 21474836470000000
time is 0.043577
total is 21474836470000000
time is 0.041678
total is 21474836470000000
time is 0.041574
total is 21474836470000000
time is 0.049230
total is 21474836470000000
time is 0.050784
total is 21474836470000000
time is 0.041619
total is 21474836470000000
time is 0.034542
total is 21474836470000000
time is 0.029880
total is 21474836470000000
time is 0.032231
total is 21474836470000000