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81542248163 is a prime number
BaseRepresentation
bin100101111110001001…
…0111111011011100011
321210110211010101202022
41023330102333123203
52313444303420123
6101243205212055
75614456446635
oct1137422773343
9253424111668
1081542248163
1131644522a42
121397840102b
1378c67c9cac
143d37918a55
1521c3ab11c8
hex12fc4bf6e3

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".