128568385173 has 4 divisors (see below), whose sum is σ = 171424513568. Its totient is φ = 85712256780.

The previous prime is 128568385171. The next prime is 128568385189. The reversal of 128568385173 is 371583865821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 128568385173 - 2¹ = 128568385171 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128568385171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21428064193 + ... + 21428064198.

It is an arithmetic number, because the mean of its divisors is an integer number (42856128392).

Almost surely, 2^128568385173 is an apocalyptic number.

It is an amenable number.

128568385173 is a deficient number, since it is larger than the sum of its proper divisors (42856128395).

128568385173 is an equidigital number, since it uses as much as digits as its factorization.

128568385173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42856128394.

The product of its digits is 9676800, while the sum is 57.

The spelling of 128568385173 in words is "one hundred twenty-eight billion, five hundred sixty-eight million, three hundred eighty-five thousand, one hundred seventy-three".