128170008205 has 4 divisors (see below), whose sum is σ = 153804009852. Its totient is φ = 102536006560.

The previous prime is 128170008181. The next prime is 128170008209. The reversal of 128170008205 is 502800071821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502800071821 = 17 ⋅29576474813.

It can be written as a sum of positive squares in 2 ways, for example, as 20337897321 + 107832110884 = 142611^2 + 328378^2 .

It is not a de Polignac number, because 128170008205 - 2⁷ = 128170008077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128170008209) 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, 12817000816 + ... + 12817000825.

It is an arithmetic number, because the mean of its divisors is an integer number (38451002463).

Almost surely, 2^128170008205 is an apocalyptic number.

It is an amenable number.

128170008205 is a deficient number, since it is larger than the sum of its proper divisors (25634001647).

128170008205 is an equidigital number, since it uses as much as digits as its factorization.

128170008205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25634001646.

The product of its (nonzero) digits is 8960, while the sum is 34.

The spelling of 128170008205 in words is "one hundred twenty-eight billion, one hundred seventy million, eight thousand, two hundred five".