12185616281 has 4 divisors (see below), whose sum is σ = 12191864064. Its totient is φ = 12179368500.

The previous prime is 12185616259. The next prime is 12185616299. The reversal of 12185616281 is 18261658121.

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 a cyclic number.

It is not a de Polignac number, because 12185616281 - 2⁶ = 12185616217 is a prime.

It is a super-2 number, since 2×12185616281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12185616221) 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, 3120965 + ... + 3124866.

It is an arithmetic number, because the mean of its divisors is an integer number (3047966016).

Almost surely, 2^12185616281 is an apocalyptic number.

It is an amenable number.

12185616281 is a deficient number, since it is larger than the sum of its proper divisors (6247783).

12185616281 is an equidigital number, since it uses as much as digits as its factorization.

12185616281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247782.

The product of its digits is 46080, while the sum is 41.

The spelling of 12185616281 in words is "twelve billion, one hundred eighty-five million, six hundred sixteen thousand, two hundred eighty-one".