12278445689 has 4 divisors (see below), whose sum is σ = 12278709156. Its totient is φ = 12278182224.

The previous prime is 12278445679. The next prime is 12278445701. The reversal of 12278445689 is 98654487221.

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 10927148089 + 1351297600 = 104533^2 + 36760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12278445689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12278445679) 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, 40994 + ... + 161979.

It is an arithmetic number, because the mean of its divisors is an integer number (3069677289).

Almost surely, 2^12278445689 is an apocalyptic number.

It is an amenable number.

12278445689 is a deficient number, since it is larger than the sum of its proper divisors (263467).

12278445689 is an equidigital number, since it uses as much as digits as its factorization.

12278445689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263466.

The product of its digits is 7741440, while the sum is 56.

The spelling of 12278445689 in words is "twelve billion, two hundred seventy-eight million, four hundred forty-five thousand, six hundred eighty-nine".