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13666558222717 is a prime number
BaseRepresentation
bin1100011011011111111001…
…0110010010000101111101
31210101111202221101121210121
43012313332112102011331
53242403102401111332
645022155152334541
72610243024122101
oct306677626220575
953344687347717
1013666558222717
114399a55915124
121648806844451
1378199b99a95a
14353671b5b901
1518a7728a9797
hexc6dfe59217d

13666558222717 has 2 divisors, whose sum is σ = 13666558222718. Its totient is φ = 13666558222716.

The previous prime is 13666558222711. The next prime is 13666558222771. The reversal of 13666558222717 is 71722285566631.

Together with next prime (13666558222771) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13666522474276 + 35748441 = 3696826^2 + 5979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-13666558222717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13666558222711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833279111358 + 6833279111359.

It is an arithmetic number, because the mean of its divisors is an integer number (6833279111359).

Almost surely, 213666558222717 is an apocalyptic number.

It is an amenable number.

13666558222717 is a deficient number, since it is larger than the sum of its proper divisors (1).

13666558222717 is an equidigital number, since it uses as much as digits as its factorization.

13666558222717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 61.

The spelling of 13666558222717 in words is "thirteen trillion, six hundred sixty-six billion, five hundred fifty-eight million, two hundred twenty-two thousand, seven hundred seventeen".