Default for particle ID

Hi,

I'm trying to find out contact between particles in huge size simulation which contain millions of particles.

What i'm using for this is

compute (name) (group name) pair/gran/local id pos force_normal delta

and then

dump (name) (group name) local (time step) (directory) & c_(name)[1] c_(name)[2], ... c_(name)[13]

But the problem caused here is when particle id is over 1 million, then particle id becomes 1.0e+06.

And it seems like ones place number is missing.

If you look at the picture I attached, you can see that only 6 digits are existed.

When I try to look at the particle number 1165683, there is no particle id 1165683 but 1.16568e+06.

Should I look for the compute_pair_gran_local.cpp?