How to efficiently store large integers in arrays

I wrote an example of storing an array of large numbers:

big_num = 6400
mask = (1 << 64) - 1
for i in range(100):
     arr[i] = big_num & mask
     big_num >>= 64

the actual measurement is slow
how to write efficiently

Sep.22,2021

python3 has built-in large integers,

>>> 2**1000
10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eaf212-222e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eaf212-222e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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