1685355385213 has 2 divisors, whose sum is σ = 1685355385214. Its totient is φ = 1685355385212.

The previous prime is 1685355385211. The next prime is 1685355385243. The reversal of 1685355385213 is 3125835535861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1661309610724 + 24045774489 = 1288918^2 + 155067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685355385213 - 2¹ = 1685355385211 is a prime.

Together with 1685355385211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685355385211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842677692606 + 842677692607.

It is an arithmetic number, because the mean of its divisors is an integer number (842677692607).

Almost surely, 2^{1685355385213} is an apocalyptic number.

It is an amenable number.

1685355385213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685355385213 is an equidigital number, since it uses as much as digits as its factorization.

1685355385213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960000, while the sum is 55.

The spelling of 1685355385213 in words is "one trillion, six hundred eighty-five billion, three hundred fifty-five million, three hundred eighty-five thousand, two hundred thirteen".