12170182205 has 4 divisors (see below), whose sum is σ = 14604218652. Its totient is φ = 9736145760.

The previous prime is 12170182201. The next prime is 12170182231. The reversal of 12170182205 is 50228107121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50228107121 = 151 ⋅332636471.

It can be written as a sum of positive squares in 2 ways, for example, as 4885730404 + 7284451801 = 69898^2 + 85349^2 .

It is not a de Polignac number, because 12170182205 - 2² = 12170182201 is a prime.

It is a super-2 number, since 2×12170182205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12170182201) 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, 1217018216 + ... + 1217018225.

It is an arithmetic number, because the mean of its divisors is an integer number (3651054663).

Almost surely, 2^12170182205 is an apocalyptic number.

It is an amenable number.

12170182205 is a deficient number, since it is larger than the sum of its proper divisors (2434036447).

12170182205 is an equidigital number, since it uses as much as digits as its factorization.

12170182205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434036446.

The product of its (nonzero) digits is 2240, while the sum is 29.

Adding to 12170182205 its reverse (50228107121), we get a palindrome (62398289326).

The spelling of 12170182205 in words is "twelve billion, one hundred seventy million, one hundred eighty-two thousand, two hundred five".