6805981786979 has 4 divisors (see below), whose sum is σ = 6806049664584. Its totient is φ = 6805913909376.

The previous prime is 6805981786909. The next prime is 6805981787051. The reversal of 6805981786979 is 9796871895086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6805981786979 - 2¹⁶ = 6805981721443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6805981786897 and 6805981786906.

It is not an unprimeable number, because it can be changed into a prime (6805981786909) 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 in 3 ways as a sum of consecutive naturals, for example, 33788177 + ... + 33989010.

It is an arithmetic number, because the mean of its divisors is an integer number (1701512416146).

Almost surely, 2^{6805981786979} is an apocalyptic number.

6805981786979 is a deficient number, since it is larger than the sum of its proper divisors (67877605).

6805981786979 is a wasteful number, since it uses less digits than its factorization.

6805981786979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67877604.

The product of its (nonzero) digits is 3292047360, while the sum is 83.

The spelling of 6805981786979 in words is "six trillion, eight hundred five billion, nine hundred eighty-one million, seven hundred eighty-six thousand, nine hundred seventy-nine".