12180861218 has 4 divisors (see below), whose sum is σ = 18271291830. Its totient is φ = 6090430608.

The previous prime is 12180861197. The next prime is 12180861223. The reversal of 12180861218 is 81216808121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81216808121 = 17761 ⋅4572761.

It can be written as a sum of positive squares in only one way, i.e., 11330963809 + 849897409 = 106447^2 + 29153^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3045215303 + ... + 3045215306.

Almost surely, 2^12180861218 is an apocalyptic number.

12180861218 is a deficient number, since it is larger than the sum of its proper divisors (6090430612).

12180861218 is an equidigital number, since it uses as much as digits as its factorization.

12180861218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090430611.

The product of its (nonzero) digits is 12288, while the sum is 38.

The spelling of 12180861218 in words is "twelve billion, one hundred eighty million, eight hundred sixty-one thousand, two hundred eighteen".