6819782161 has 2 divisors, whose sum is σ = 6819782162. Its totient is φ = 6819782160.

The previous prime is 6819782149. The next prime is 6819782213. The reversal of 6819782161 is 1612879186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5519747025 + 1300035136 = 74295^2 + 36056^2 .

It is a cyclic number.

It is not a de Polignac number, because 6819782161 - 2⁹ = 6819781649 is a prime.

It is not a weakly prime, because it can be changed into another prime (6819782561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3409891080 + 3409891081.

It is an arithmetic number, because the mean of its divisors is an integer number (3409891081).

Almost surely, 2^6819782161 is an apocalyptic number.

It is an amenable number.

6819782161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6819782161 is an equidigital number, since it uses as much as digits as its factorization.

6819782161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 49.

The square root of 6819782161 is about 82581.9723729096. The cubic root of 6819782161 is about 1896.3718538435.

The spelling of 6819782161 in words is "six billion, eight hundred nineteen million, seven hundred eighty-two thousand, one hundred sixty-one".