Base | Representation |
---|---|
bin | 10010100011101100111110… |
… | …100001111011010010001100 |
3 | 101200222122010112112022121202 |
4 | 102203230332201323102030 |
5 | 41144213301011404420 |
6 | 445330534000045032 |
7 | 23122504605243641 |
oct | 2243547641732214 |
9 | 350878115468552 |
10 | 81618312606860 |
11 | 2400814a755167 |
12 | 91a2213903778 |
13 | 367075c9ab8b3 |
14 | 16224c1403dc8 |
15 | 96812da75575 |
hex | 4a3b3e87b48c |
81618312606860 has 24 divisors (see below), whose sum is σ = 171398626708176. Its totient is φ = 32647292617280.
The previous prime is 81618312606799. The next prime is 81618312606877. The reversal of 81618312606860 is 6860621381618.
It is a super-3 number, since 3×816183126068603 (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a junction number, because it is equal to n+sod(n) for n = 81618312606796 and 81618312606805.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36202895 + ... + 38391225.
It is an arithmetic number, because the mean of its divisors is an integer number (7141609446174).
Almost surely, 281618312606860 is an apocalyptic number.
It is an amenable number.
81618312606860 is an abundant number, since it is smaller than the sum of its proper divisors (89780314101316).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81618312606860 is a wasteful number, since it uses less digits than its factorization.
81618312606860 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4053193 (or 4053191 counting only the distinct ones).
The product of its (nonzero) digits is 3981312, while the sum is 56.
The spelling of 81618312606860 in words is "eighty-one trillion, six hundred eighteen billion, three hundred twelve million, six hundred six thousand, eight hundred sixty".
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