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16868567021809 is a prime number
BaseRepresentation
bin1111010101111000010011…
…1100011111100011110001
32012201121201102212011001111
43311132010330133203301
54202333311124144214
655513151313433321
73360466546623256
oct365360474374361
965647642764044
1016868567021809
115413a12359538
121a852a8b6b841
13954911a55129
1442462b84142d
151e3bcbac25c4
hexf5784f1f8f1

16868567021809 has 2 divisors, whose sum is σ = 16868567021810. Its totient is φ = 16868567021808.

The previous prime is 16868567021633. The next prime is 16868567021851. The reversal of 16868567021809 is 90812076586861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323036560784 + 5545530461025 = 3364972^2 + 2354895^2 .

It is a cyclic number.

It is not a de Polignac number, because 16868567021809 - 29 = 16868567021297 is a prime.

It is not a weakly prime, because it can be changed into another prime (16868567021609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8434283510904 + 8434283510905.

It is an arithmetic number, because the mean of its divisors is an integer number (8434283510905).

Almost surely, 216868567021809 is an apocalyptic number.

It is an amenable number.

16868567021809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16868567021809 is an equidigital number, since it uses as much as digits as its factorization.

16868567021809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69672960, while the sum is 67.

The spelling of 16868567021809 in words is "sixteen trillion, eight hundred sixty-eight billion, five hundred sixty-seven million, twenty-one thousand, eight hundred nine".