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161133455620 = 22537683318811
BaseRepresentation
bin1001011000010001001…
…1010110100100000100
3120101220200000122210201
42112010103112210010
510120000131034440
6202005041100244
714433015526354
oct2260423264404
9511820018721
10161133455620
11623776a9145
122728b327684
131226c032417
147b28280b64
1542d123119a
hex25844d6904

161133455620 has 48 divisors (see below), whose sum is σ = 348035583168. Its totient is φ = 62619384960.

The previous prime is 161133455611. The next prime is 161133455647. The reversal of 161133455620 is 26554331161.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 161133455620.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346015 + ... + 664825.

It is an arithmetic number, because the mean of its divisors is an integer number (7250741316).

Almost surely, 2161133455620 is an apocalyptic number.

161133455620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161133455620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174017791584).

161133455620 is an abundant number, since it is smaller than the sum of its proper divisors (186902127548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161133455620 is a wasteful number, since it uses less digits than its factorization.

161133455620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319540 (or 319538 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 161133455620 its reverse (26554331161), we get a palindrome (187687786781).

The spelling of 161133455620 in words is "one hundred sixty-one billion, one hundred thirty-three million, four hundred fifty-five thousand, six hundred twenty".

Divisors: 1 2 4 5 10 20 37 74 148 185 370 683 740 1366 2732 3415 6830 13660 25271 50542 101084 126355 252710 318811 505420 637622 1275244 1594055 3188110 6376220 11796007 23592014 47184028 58980035 117960070 217747913 235920140 435495826 870991652 1088739565 2177479130 4354958260 8056672781 16113345562 32226691124 40283363905 80566727810 161133455620