12180427778 has 4 divisors (see below), whose sum is σ = 18270641670. Its totient is φ = 6090213888.

The previous prime is 12180427769. The next prime is 12180427799. The reversal of 12180427778 is 87772408121.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 11478336769 + 702091009 = 107137^2 + 26497^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3045106943 + ... + 3045106946.

Almost surely, 2^12180427778 is an apocalyptic number.

12180427778 is a deficient number, since it is larger than the sum of its proper divisors (6090213892).

12180427778 is an equidigital number, since it uses as much as digits as its factorization.

12180427778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090213891.

The product of its (nonzero) digits is 351232, while the sum is 47.

The spelling of 12180427778 in words is "twelve billion, one hundred eighty million, four hundred twenty-seven thousand, seven hundred seventy-eight".