It is our understanding that in the current setting of SI units, the two fundamental physical constants of 1. Planck constant; and 2. speed of light, actually accept the following tests:
A. 662607015 / 105 is an integer.
B. 299792458 / 511 is an integer.
And:
C. 105 + 511 = 616.
This number 616 is (perhaps) easy to remember as it is "encoded" (yea, perhaps) in the Marvel Studio series movie(s). (Ref: Doctor Strange, and or others.)
At least for educational purposes for 1st year undergraduate students, the above (A, B, C) test can be called the "Earth-616 Test Code".