12185881761 has 8 divisors (see below), whose sum is σ = 16258112640. Its totient is φ = 8118786032.

The previous prime is 12185881753. The next prime is 12185881769. The reversal of 12185881761 is 16718858121.

It is a happy number.

12185881761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12185881753) and next prime (12185881769).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12185881761 - 2³ = 12185881753 is a prime.

It is a super-2 number, since 2×12185881761² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12185881761.

It is not an unprimeable number, because it can be changed into a prime (12185881769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1278246 + ... + 1287743.

It is an arithmetic number, because the mean of its divisors is an integer number (2032264080).

Almost surely, 2^12185881761 is an apocalyptic number.

It is an amenable number.

12185881761 is a deficient number, since it is larger than the sum of its proper divisors (4072230879).

12185881761 is a wasteful number, since it uses less digits than its factorization.

12185881761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567575.

The product of its digits is 215040, while the sum is 48.

The spelling of 12185881761 in words is "twelve billion, one hundred eighty-five million, eight hundred eighty-one thousand, seven hundred sixty-one".