16185128173 has 2 divisors, whose sum is σ = 16185128174. Its totient is φ = 16185128172.

The previous prime is 16185128161. The next prime is 16185128177. The reversal of 16185128173 is 37182158161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9035072809 + 7150055364 = 95053^2 + 84558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16185128173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16185128177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8092564086 + 8092564087.

It is an arithmetic number, because the mean of its divisors is an integer number (8092564087).

Almost surely, 2^16185128173 is an apocalyptic number.

It is an amenable number.

16185128173 is a deficient number, since it is larger than the sum of its proper divisors (1).

16185128173 is an equidigital number, since it uses as much as digits as its factorization.

16185128173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The spelling of 16185128173 in words is "sixteen billion, one hundred eighty-five million, one hundred twenty-eight thousand, one hundred seventy-three".