66+67=133 cesium 133 (SI second, 1967) http://physics.nist.gov/cuu/Units/second.html 11933316181512171330203317121518161333911 http://primes.utm.edu/curios/page.php?number_id=2393 1+1+9+3+3+3+1+6+1+8+1+5+1+2+1+7+1+3+3=60