6777851678369 has 2 divisors, whose sum is σ = 6777851678370. Its totient is φ = 6777851678368.

The previous prime is 6777851678341. The next prime is 6777851678419. The reversal of 6777851678369 is 9638761587776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5745067290769 + 1032784387600 = 2396887^2 + 1016260^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777851678369 - 2³² = 6773556711073 is a prime.

It is a super-2 number, since 2×6777851678369² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6777851678293 and 6777851678302.

It is not a weakly prime, because it can be changed into another prime (6777851678569) 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, 3388925839184 + 3388925839185.

It is an arithmetic number, because the mean of its divisors is an integer number (3388925839185).

Almost surely, 2^{6777851678369} is an apocalyptic number.

It is an amenable number.

6777851678369 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777851678369 is an equidigital number, since it uses as much as digits as its factorization.

6777851678369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480842240, while the sum is 80.

The spelling of 6777851678369 in words is "six trillion, seven hundred seventy-seven billion, eight hundred fifty-one million, six hundred seventy-eight thousand, three hundred sixty-nine".