12446778889 has 2 divisors, whose sum is σ = 12446778890. Its totient is φ = 12446778888.

The previous prime is 12446778829. The next prime is 12446778899. The reversal of 12446778889 is 98887764421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9763020864 + 2683758025 = 98808^2 + 51805^2 .

It is an emirp because it is prime and its reverse (98887764421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12446778889 - 2¹³ = 12446770697 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 12446778889.

It is not a weakly prime, because it can be changed into another prime (12446778829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6223389444 + 6223389445.

It is an arithmetic number, because the mean of its divisors is an integer number (6223389445).

Almost surely, 2^12446778889 is an apocalyptic number.

It is an amenable number.

12446778889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12446778889 is an equidigital number, since it uses as much as digits as its factorization.

12446778889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 64.

The spelling of 12446778889 in words is "twelve billion, four hundred forty-six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".