12944778881 has 2 divisors, whose sum is σ = 12944778882. Its totient is φ = 12944778880.

The previous prime is 12944778863. The next prime is 12944778901. The reversal of 12944778881 is 18887744921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12279964225 + 664814656 = 110815^2 + 25784^2 .

It is a cyclic number.

It is not a de Polignac number, because 12944778881 - 2¹⁴ = 12944762497 is a prime.

It is a super-2 number, since 2×12944778881² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12944778881.

It is not a weakly prime, because it can be changed into another prime (12944774881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6472389440 + 6472389441.

It is an arithmetic number, because the mean of its divisors is an integer number (6472389441).

Almost surely, 2^12944778881 is an apocalyptic number.

It is an amenable number.

12944778881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12944778881 is an equidigital number, since it uses as much as digits as its factorization.

12944778881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 59.

The spelling of 12944778881 in words is "twelve billion, nine hundred forty-four million, seven hundred seventy-eight thousand, eight hundred eighty-one".