6858518309 has 2 divisors, whose sum is σ = 6858518310. Its totient is φ = 6858518308.

The previous prime is 6858518297. The next prime is 6858518339. The reversal of 6858518309 is 9038158586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5768858209 + 1089660100 = 75953^2 + 33010^2 .

It is a cyclic number.

It is not a de Polignac number, because 6858518309 - 2³² = 2563551013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6858518339) 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, 3429259154 + 3429259155.

It is an arithmetic number, because the mean of its divisors is an integer number (3429259155).

Almost surely, 2^6858518309 is an apocalyptic number.

It is an amenable number.

6858518309 is a deficient number, since it is larger than the sum of its proper divisors (1).

6858518309 is an equidigital number, since it uses as much as digits as its factorization.

6858518309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The square root of 6858518309 is about 82816.1717842596. The cubic root of 6858518309 is about 1899.9555214888.

The spelling of 6858518309 in words is "six billion, eight hundred fifty-eight million, five hundred eighteen thousand, three hundred nine".