12278181205 has 4 divisors (see below), whose sum is σ = 14733817452. Its totient is φ = 9822544960.

The previous prime is 12278181203. The next prime is 12278181217. The reversal of 12278181205 is 50218187221.

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 8601820516 + 3676360689 = 92746^2 + 60633^2 .

It is not a de Polignac number, because 12278181205 - 2¹ = 12278181203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278181203) 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, 1227818116 + ... + 1227818125.

It is an arithmetic number, because the mean of its divisors is an integer number (3683454363).

Almost surely, 2^12278181205 is an apocalyptic number.

It is an amenable number.

12278181205 is a deficient number, since it is larger than the sum of its proper divisors (2455636247).

12278181205 is an equidigital number, since it uses as much as digits as its factorization.

12278181205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455636246.

The product of its (nonzero) digits is 17920, while the sum is 37.

The spelling of 12278181205 in words is "twelve billion, two hundred seventy-eight million, one hundred eighty-one thousand, two hundred five".