6778895006789 has 2 divisors, whose sum is σ = 6778895006790. Its totient is φ = 6778895006788.

The previous prime is 6778895006761. The next prime is 6778895006833. The reversal of 6778895006789 is 9876005988776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5813726301889 + 965168704900 = 2411167^2 + 982430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778895006789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778895006089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389447503394 + 3389447503395.

It is an arithmetic number, because the mean of its divisors is an integer number (3389447503395).

Almost surely, 2^{6778895006789} is an apocalyptic number.

It is an amenable number.

6778895006789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778895006789 is an equidigital number, since it uses as much as digits as its factorization.

6778895006789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560481280, while the sum is 80.

The spelling of 6778895006789 in words is "six trillion, seven hundred seventy-eight billion, eight hundred ninety-five million, six thousand, seven hundred eighty-nine".