18872171716859 has 2 divisors, whose sum is σ = 18872171716860. Its totient is φ = 18872171716858.

The previous prime is 18872171716841. The next prime is 18872171716883. The reversal of 18872171716859 is 95861717127881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18872171716859 - 2⁴⁰ = 17772660089083 is a prime.

It is a super-3 number, since 3×18872171716859³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 18872171716792 and 18872171716801.

It is not a weakly prime, because it can be changed into another prime (18872171716759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436085858429 + 9436085858430.

It is an arithmetic number, because the mean of its divisors is an integer number (9436085858430).

Almost surely, 2^{18872171716859} is an apocalyptic number.

18872171716859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872171716859 is an equidigital number, since it uses as much as digits as its factorization.

18872171716859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94832640, while the sum is 71.

The spelling of 18872171716859 in words is "eighteen trillion, eight hundred seventy-two billion, one hundred seventy-one million, seven hundred sixteen thousand, eight hundred fifty-nine".