2778338919799 has 2 divisors, whose sum is σ = 2778338919800. Its totient is φ = 2778338919798.

The previous prime is 2778338919749. The next prime is 2778338919887. The reversal of 2778338919799 is 9979198338772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2778338919799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778338919749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389169459899 + 1389169459900.

It is an arithmetic number, because the mean of its divisors is an integer number (1389169459900).

Almost surely, 2^{2778338919799} is an apocalyptic number.

2778338919799 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778338919799 is an equidigital number, since it uses as much as digits as its factorization.

2778338919799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592487296, while the sum is 82.

The spelling of 2778338919799 in words is "two trillion, seven hundred seventy-eight billion, three hundred thirty-eight million, nine hundred nineteen thousand, seven hundred ninety-nine".