1688017856887 has 2 divisors, whose sum is σ = 1688017856888. Its totient is φ = 1688017856886.

The previous prime is 1688017856873. The next prime is 1688017856929. The reversal of 1688017856887 is 7886587108861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1688017856887 - 2²⁷ = 1687883639159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688017856087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844008928443 + 844008928444.

It is an arithmetic number, because the mean of its divisors is an integer number (844008928444).

Almost surely, 2^{1688017856887} is an apocalyptic number.

1688017856887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688017856887 is an equidigital number, since it uses as much as digits as its factorization.

1688017856887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 289013760, while the sum is 73.

The spelling of 1688017856887 in words is "one trillion, six hundred eighty-eight billion, seventeen million, eight hundred fifty-six thousand, eight hundred eighty-seven".