64/32 bit arch -- lscpu arch /proc/cpuinfo | isainfo -b

By OK -
#isainfo -b
64

#arch
i686


#lscpu
Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Stepping:              3
CPU MHz:               2494.236
BogoMIPS:              4988.47
Hypervisor vendor:     VMware
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              3072K

or you can check for lm flag in /proc/cpuinfo

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