6858642779 has 2 divisors, whose sum is σ = 6858642780. Its totient is φ = 6858642778.

The previous prime is 6858642761. The next prime is 6858642793. The reversal of 6858642779 is 9772468586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6858642779 is a prime.

It is not a weakly prime, because it can be changed into another prime (6858642719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3429321389 + 3429321390.

It is an arithmetic number, because the mean of its divisors is an integer number (3429321390).

Almost surely, 2^6858642779 is an apocalyptic number.

6858642779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6858642779 is an equidigital number, since it uses as much as digits as its factorization.

6858642779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 62.

The square root of 6858642779 is about 82816.9232645116. The cubic root of 6858642779 is about 1899.9670150322.

The spelling of 6858642779 in words is "six billion, eight hundred fifty-eight million, six hundred forty-two thousand, seven hundred seventy-nine".