I think you might be confused because it is showing scientific notation? '{}'.format() should help in that case.
Xi = (70 + 1344736401384689745317259585614247891453883777111/315)% 115792089210356248762697446949407573529996955224135760342422259061068512044369
print('{0:f}'.format(Xi))
solved How to calculate this mathematical expression in python? [closed]