1688017856873 has 2 divisors, whose sum is σ = 1688017856874. Its totient is φ = 1688017856872.

The previous prime is 1688017856851. The next prime is 1688017856887. The reversal of 1688017856873 is 3786587108861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 914905641049 + 773112215824 = 956507^2 + 879268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688017856873 - 2⁶ = 1688017856809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688017850873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844008928436 + 844008928437.

It is an arithmetic number, because the mean of its divisors is an integer number (844008928437).

Almost surely, 2^{1688017856873} is an apocalyptic number.

It is an amenable number.

1688017856873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688017856873 is an equidigital number, since it uses as much as digits as its factorization.

1688017856873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108380160, while the sum is 68.

The spelling of 1688017856873 in words is "one trillion, six hundred eighty-eight billion, seventeen million, eight hundred fifty-six thousand, eight hundred seventy-three".