6807442781 has 2 divisors, whose sum is σ = 6807442782. Its totient is φ = 6807442780.

The previous prime is 6807442777. The next prime is 6807442847. The reversal of 6807442781 is 1872447086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6648934681 + 158508100 = 81541^2 + 12590^2 .

It is a cyclic number.

It is not a de Polignac number, because 6807442781 - 2² = 6807442777 is a prime.

It is a super-2 number, since 2×6807442781² = 92682554433178027922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6807442711) 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, 3403721390 + 3403721391.

It is an arithmetic number, because the mean of its divisors is an integer number (3403721391).

Almost surely, 2^6807442781 is an apocalyptic number.

It is an amenable number.

6807442781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6807442781 is an equidigital number, since it uses as much as digits as its factorization.

6807442781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 47.

The square root of 6807442781 is about 82507.2286590696. The cubic root of 6807442781 is about 1895.2274292100.

The spelling of 6807442781 in words is "six billion, eight hundred seven million, four hundred forty-two thousand, seven hundred eighty-one".