```
# integer number to english word conversion
# can be used for numbers as large as 999 vigintillion
# (vigintillion --> 10 to the power 60)
# tested with Python24 vegaseat 07dec2006
def int2word(n):
"""
convert an integer number n into a string of english words
"""
# break the number into groups of 3 digits using slicing
# each group representing hundred, thousand, million, billion, ...
n3 = []
r1 = ""
# create numeric string
ns = str(n)
for k in range(3, 33, 3):
r = ns[-k:]
q = len(ns) - k
# break if end of ns has been reached
if q < -2:
break
else:
if q >= 0:
n3.append(int(r[:3]))
elif q >= -1:
n3.append(int(r[:2]))
elif q >= -2:
n3.append(int(r[:1]))
r1 = r
#print n3 # test
# break each group of 3 digits into
# ones, tens/twenties, hundreds
# and form a string
nw = ""
for i, x in enumerate(n3):
b1 = x % 10
b2 = (x % 100)//10
b3 = (x % 1000)//100
#print b1, b2, b3 # test
if x == 0:
continue # skip
else:
t = thousands[i]
if b2 == 0:
nw = ones[b1] + t + nw
elif b2 == 1:
nw = tens[b1] + t + nw
elif b2 > 1:
nw = twenties[b2] + ones[b1] + t + nw
if b3 > 0:
nw = ones[b3] + "hundred " + nw
return nw
############# globals ################
ones = ["", "one ","two ","three ","four ", "five ",
"six ","seven ","eight ","nine "]
tens = ["ten ","eleven ","twelve ","thirteen ", "fourteen ",
"fifteen ","sixteen ","seventeen ","eighteen ","nineteen "]
twenties = ["","","twenty ","thirty ","forty ",
"fifty ","sixty ","seventy ","eighty ","ninety "]
thousands = ["","thousand ","million ", "billion ", "trillion ",
"quadrillion ", "quintillion ", "sextillion ", "septillion ","octillion ",
"nonillion ", "decillion ", "undecillion ", "duodecillion ", "tredecillion ",
"quattuordecillion ", "quindecillion", "sexdecillion ", "septendecillion ",
"octodecillion ", "novemdecillion ", "vigintillion "]
if __name__ == '__main__':
# select an integer number n for testing or get it from user input
#n = 4321234567890
#n = 1111111111111
#n = 1234567890123
n = 1001000100100111
#n = 1
print n
print "-"*50
print int2word(n)
print "-"*50
```

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