6778129712971 has 2 divisors, whose sum is σ = 6778129712972. Its totient is φ = 6778129712970.

The previous prime is 6778129712969. The next prime is 6778129712983. The reversal of 6778129712971 is 1792179218776.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6778129712971 - 2¹ = 6778129712969 is a prime.

Together with 6778129712969, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6778129712897 and 6778129712906.

It is not a weakly prime, because it can be changed into another prime (6778129712671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389064856485 + 3389064856486.

It is an arithmetic number, because the mean of its divisors is an integer number (3389064856486).

Almost surely, 2^{6778129712971} is an apocalyptic number.

6778129712971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778129712971 is an equidigital number, since it uses as much as digits as its factorization.

6778129712971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37340352, while the sum is 67.

The spelling of 6778129712971 in words is "six trillion, seven hundred seventy-eight billion, one hundred twenty-nine million, seven hundred twelve thousand, nine hundred seventy-one".