12185001817 has 4 divisors (see below), whose sum is σ = 12188835556. Its totient is φ = 12181168080.

The previous prime is 12185001781. The next prime is 12185001823. The reversal of 12185001817 is 71810058121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3986785881 + 8198215936 = 63141^2 + 90544^2 .

It is a cyclic number.

It is not a de Polignac number, because 12185001817 - 2²⁷ = 12050784089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12185001877) 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, 1912098 + ... + 1918459.

It is an arithmetic number, because the mean of its divisors is an integer number (3047208889).

Almost surely, 2^12185001817 is an apocalyptic number.

It is an amenable number.

12185001817 is a deficient number, since it is larger than the sum of its proper divisors (3833739).

12185001817 is an equidigital number, since it uses as much as digits as its factorization.

12185001817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833738.

The product of its (nonzero) digits is 4480, while the sum is 34.

Adding to 12185001817 its reverse (71810058121), we get a palindrome (83995059938).

The spelling of 12185001817 in words is "twelve billion, one hundred eighty-five million, one thousand, eight hundred seventeen".