18389975173 has 2 divisors, whose sum is σ = 18389975174. Its totient is φ = 18389975172.

The previous prime is 18389975171. The next prime is 18389975203. The reversal of 18389975173 is 37157998381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17521022689 + 868952484 = 132367^2 + 29478^2 .

It is a cyclic number.

It is not a de Polignac number, because 18389975173 - 2¹ = 18389975171 is a prime.

Together with 18389975171, 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 (18389975171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9194987586 + 9194987587.

It is an arithmetic number, because the mean of its divisors is an integer number (9194987587).

Almost surely, 2^18389975173 is an apocalyptic number.

It is an amenable number.

18389975173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18389975173 is an equidigital number, since it uses as much as digits as its factorization.

18389975173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 61.

The spelling of 18389975173 in words is "eighteen billion, three hundred eighty-nine million, nine hundred seventy-five thousand, one hundred seventy-three".