math - python long integer division error. how do I fix this? -

this problem arose prime factorization function. when try divide long integer integer. gives value in scientific notation. , not correct answer.

18291821821212182811 / 3 = 6.097273940404061e+18 

here,

6.097273940404061e+18 same this, 6097273940404061000

6097273940404061000 * 3 must equal 18291821821212182811

but there 189 integer differences.

6097273940404061000 * 3 189 bigger 18291821821212182811

6097273940404061000 * 3 - 18291821821212182811 = 189

so why not give exact number?? thinking python changes form scientific notation floating point , leads arithmetic error. there way around ? there way can tell python not change floating point during calculation if that's problem.

you have use integer division //:

18291821821212182811 // 3 = 6097273940404060937