6891084378769 has 2 divisors, whose sum is σ = 6891084378770. Its totient is φ = 6891084378768.

The previous prime is 6891084378757. The next prime is 6891084378809. The reversal of 6891084378769 is 9678734801986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6693293379600 + 197790999169 = 2587140^2 + 444737^2 .

It is a cyclic number.

It is not a de Polignac number, because 6891084378769 - 2⁷ = 6891084378641 is a prime.

It is a super-2 number, since 2×6891084378769² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6891084378695 and 6891084378704.

It is not a weakly prime, because it can be changed into another prime (6891084378469) 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, 3445542189384 + 3445542189385.

It is an arithmetic number, because the mean of its divisors is an integer number (3445542189385).

Almost surely, 2^{6891084378769} is an apocalyptic number.

It is an amenable number.

6891084378769 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891084378769 is an equidigital number, since it uses as much as digits as its factorization.

6891084378769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 877879296, while the sum is 76.

The spelling of 6891084378769 in words is "six trillion, eight hundred ninety-one billion, eighty-four million, three hundred seventy-eight thousand, seven hundred sixty-nine".