18685368666773 has 2 divisors, whose sum is σ = 18685368666774. Its totient is φ = 18685368666772.

The previous prime is 18685368666703. The next prime is 18685368666857. The reversal of 18685368666773 is 37766686358681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16975660743409 + 1709707923364 = 4120153^2 + 1307558^2 .

It is a cyclic number.

It is not a de Polignac number, because 18685368666773 - 2³⁰ = 18684294924949 is a prime.

It is a super-3 number, since 3×18685368666773³ (a number of 41 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18685368666703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342684333386 + 9342684333387.

It is an arithmetic number, because the mean of its divisors is an integer number (9342684333387).

Almost surely, 2^{18685368666773} is an apocalyptic number.

It is an amenable number.

18685368666773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685368666773 is an equidigital number, since it uses as much as digits as its factorization.

18685368666773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8778792960, while the sum is 80.

The spelling of 18685368666773 in words is "eighteen trillion, six hundred eighty-five billion, three hundred sixty-eight million, six hundred sixty-six thousand, seven hundred seventy-three".