programa:=proc(n) local a,b,c,i;
i:=1;
b:=n;
while b>0 do a(i):= b mod 36;
    b:=(b-a(i))/36;
    i:=i+1;
    od;
    c:=[seq(a(i-k),k=1..i-1)];
    return c;
end:

Ejecutando tenemos:

>> programa (88374081933261013189);

[18, 23, 15, 10, 21, 18, 11, 18, 21, 18, 13, 10, 13]

>> programa (2287653442455291428759);

[13, 14, 28, 18, 23, 29, 14, 16, 27, 10, 12, 18, 24, 23]

#!/usr/bin/env python
import sys

argc = len(sys.argv)
if argc<2: n = input("Número: ")
else: n = long(sys.argv[1])

p = []
while n>0:
    resto = n%36
    if resto>9: p.append(chr(resto-10+ord('a')))
    else: p.append(resto)
    n = n/36

p.reverse()
palabra = ''
for x in p: palabra += str(x)
print 'Palabra: ', palabra