1688117689243 has 2 divisors, whose sum is σ = 1688117689244. Its totient is φ = 1688117689242.

The previous prime is 1688117689241. The next prime is 1688117689249. The reversal of 1688117689243 is 3429867118861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1688117689243 - 2¹ = 1688117689241 is a prime.

Together with 1688117689241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1688117689241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844058844621 + 844058844622.

It is an arithmetic number, because the mean of its divisors is an integer number (844058844622).

Almost surely, 2^{1688117689243} is an apocalyptic number.

1688117689243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688117689243 is an equidigital number, since it uses as much as digits as its factorization.

1688117689243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 64.

The spelling of 1688117689243 in words is "one trillion, six hundred eighty-eight billion, one hundred seventeen million, six hundred eighty-nine thousand, two hundred forty-three".