Base | Representation |
---|---|
bin | 100101111110001001… |
… | …0111111011011100011 |
3 | 21210110211010101202022 |
4 | 1023330102333123203 |
5 | 2313444303420123 |
6 | 101243205212055 |
7 | 5614456446635 |
oct | 1137422773343 |
9 | 253424111668 |
10 | 81542248163 |
11 | 31644522a42 |
12 | 1397840102b |
13 | 78c67c9cac |
14 | 3d37918a55 |
15 | 21c3ab11c8 |
hex | 12fc4bf6e3 |
81542248163 has 2 divisors, whose sum is σ = 81542248164. Its totient is φ = 81542248162.
The previous prime is 81542248153. The next prime is 81542248171. The reversal of 81542248163 is 36184224518.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 81542248163 - 216 = 81542182627 is a prime.
It is not a weakly prime, because it can be changed into another prime (81542248153) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771124081 + 40771124082.
It is an arithmetic number, because the mean of its divisors is an integer number (40771124082).
Almost surely, 281542248163 is an apocalyptic number.
81542248163 is a deficient number, since it is larger than the sum of its proper divisors (1).
81542248163 is an equidigital number, since it uses as much as digits as its factorization.
81542248163 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 368640, while the sum is 44.
The spelling of 81542248163 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred sixty-three".
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