Interesting that the second number is prime and the others have very large prime factors (only 5 and 4 distinct prime numbers for 1st and 3rd numbers respectively):
(8,866,128,975,287,528)³ +
(–8,778,405,442,862,239)³ +
(–2,736,111,468,807,040)³ = 33
696950821015779435648178972565490929714876221952 -
676467453392982277424361019810585360331722557919 -
20483367622797158223817952754905569383153664000 = 33