The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
kilogram-electron volt relationship
 $(1 \ {\rm kg})c^2$
 Numerical value  5.609 588 603...  x 1035 eV
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  5.609 588 603... x 1035 eV    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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