1686317039873 has 2 divisors, whose sum is σ = 1686317039874. Its totient is φ = 1686317039872.

The previous prime is 1686317039863. The next prime is 1686317039893. The reversal of 1686317039873 is 3789307136861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665940048369 + 20376991504 = 1290713^2 + 142748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686317039873 - 2¹⁰ = 1686317038849 is a prime.

It is a super-2 number, since 2×1686317039873² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1686317039843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843158519936 + 843158519937.

It is an arithmetic number, because the mean of its divisors is an integer number (843158519937).

Almost surely, 2^{1686317039873} is an apocalyptic number.

It is an amenable number.

1686317039873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686317039873 is an equidigital number, since it uses as much as digits as its factorization.

1686317039873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 1686317039873 in words is "one trillion, six hundred eighty-six billion, three hundred seventeen million, thirty-nine thousand, eight hundred seventy-three".