6778889511749 has 2 divisors, whose sum is σ = 6778889511750. Its totient is φ = 6778889511748.

The previous prime is 6778889511703. The next prime is 6778889511767. The reversal of 6778889511749 is 9471159888776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6355153609249 + 423735902500 = 2520943^2 + 650950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778889511749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778889511349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389444755874 + 3389444755875.

It is an arithmetic number, because the mean of its divisors is an integer number (3389444755875).

Almost surely, 2^{6778889511749} is an apocalyptic number.

It is an amenable number.

6778889511749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778889511749 is an equidigital number, since it uses as much as digits as its factorization.

6778889511749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1706987520, while the sum is 80.

The spelling of 6778889511749 in words is "six trillion, seven hundred seventy-eight billion, eight hundred eighty-nine million, five hundred eleven thousand, seven hundred forty-nine".