12778993441 has 2 divisors, whose sum is σ = 12778993442. Its totient is φ = 12778993440.

The previous prime is 12778993417. The next prime is 12778993459. The reversal of 12778993441 is 14439987721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11508783841 + 1270209600 = 107279^2 + 35640^2 .

It is a cyclic number.

It is not a de Polignac number, because 12778993441 - 2¹⁹ = 12778469153 is a prime.

It is not a weakly prime, because it can be changed into another prime (12778993411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389496720 + 6389496721.

It is an arithmetic number, because the mean of its divisors is an integer number (6389496721).

Almost surely, 2^12778993441 is an apocalyptic number.

It is an amenable number.

12778993441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778993441 is an equidigital number, since it uses as much as digits as its factorization.

12778993441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The spelling of 12778993441 in words is "twelve billion, seven hundred seventy-eight million, nine hundred ninety-three thousand, four hundred forty-one".