128817156173 has 2 divisors, whose sum is σ = 128817156174. Its totient is φ = 128817156172.

The previous prime is 128817156151. The next prime is 128817156197. The reversal of 128817156173 is 371651718821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101864382244 + 26952773929 = 319162^2 + 164173^2 .

It is a cyclic number.

It is not a de Polignac number, because 128817156173 - 2⁶ = 128817156109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128817156113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64408578086 + 64408578087.

It is an arithmetic number, because the mean of its divisors is an integer number (64408578087).

Almost surely, 2^128817156173 is an apocalyptic number.

It is an amenable number.

128817156173 is a deficient number, since it is larger than the sum of its proper divisors (1).

128817156173 is an equidigital number, since it uses as much as digits as its factorization.

128817156173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 50.

The spelling of 128817156173 in words is "one hundred twenty-eight billion, eight hundred seventeen million, one hundred fifty-six thousand, one hundred seventy-three".