1686685185313 has 2 divisors, whose sum is σ = 1686685185314. Its totient is φ = 1686685185312.

The previous prime is 1686685185307. The next prime is 1686685185371. The reversal of 1686685185313 is 3135815866861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1376989596304 + 309695589009 = 1173452^2 + 556503^2 .

It is an emirp because it is prime and its reverse (3135815866861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1686685185313 - 2²¹ = 1686683088161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1686685155313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843342592656 + 843342592657.

It is an arithmetic number, because the mean of its divisors is an integer number (843342592657).

Almost surely, 2^{1686685185313} is an apocalyptic number.

It is an amenable number.

1686685185313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686685185313 is an equidigital number, since it uses as much as digits as its factorization.

1686685185313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24883200, while the sum is 61.

The spelling of 1686685185313 in words is "one trillion, six hundred eighty-six billion, six hundred eighty-five million, one hundred eighty-five thousand, three hundred thirteen".