12243778177 has 2 divisors, whose sum is σ = 12243778178. Its totient is φ = 12243778176.

The previous prime is 12243778171. The next prime is 12243778207. The reversal of 12243778177 is 77187734221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9760649616 + 2483128561 = 98796^2 + 49831^2 .

It is a cyclic number.

It is not a de Polignac number, because 12243778177 - 2³¹ = 10096294529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12243778177.

It is not a weakly prime, because it can be changed into another prime (12243778171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121889088 + 6121889089.

It is an arithmetic number, because the mean of its divisors is an integer number (6121889089).

Almost surely, 2^12243778177 is an apocalyptic number.

It is an amenable number.

12243778177 is a deficient number, since it is larger than the sum of its proper divisors (1).

12243778177 is an equidigital number, since it uses as much as digits as its factorization.

12243778177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 921984, while the sum is 49.

The spelling of 12243778177 in words is "twelve billion, two hundred forty-three million, seven hundred seventy-eight thousand, one hundred seventy-seven".