2185171870205 has 32 divisors (see below), whose sum is σ = 2773575129600. Its totient is φ = 1650017521152.

The previous prime is 2185171870097. The next prime is 2185171870207. The reversal of 2185171870205 is 5020781715812.

It is a cyclic number.

It is not a de Polignac number, because 2185171870205 - 2²⁰ = 2185170821629 is a prime.

It is a super-2 number, since 2×2185171870205² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 2185171870205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185171870207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5667449 + ... + 6040721.

It is an arithmetic number, because the mean of its divisors is an integer number (86674222800).

Almost surely, 2^{2185171870205} is an apocalyptic number.

It is an amenable number.

2185171870205 is a deficient number, since it is larger than the sum of its proper divisors (588403259395).

2185171870205 is a wasteful number, since it uses less digits than its factorization.

2185171870205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374213.

The product of its (nonzero) digits is 313600, while the sum is 47.

The spelling of 2185171870205 in words is "two trillion, one hundred eighty-five billion, one hundred seventy-one million, eight hundred seventy thousand, two hundred five".