The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-electron volt relationship
$(1 \ {\rm kg})c^2$
 Value  5.609 589 12 x 1035 eV
 Standard uncertainty  0.000 000 14 x 1035 eV
  Relative standard uncertainty   2.5 x 10-8
 Concise form  5.609 589 12(14) x 1035 eV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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