6898391779 has 2 divisors, whose sum is σ = 6898391780. Its totient is φ = 6898391778.

The previous prime is 6898391609. The next prime is 6898391813. The reversal of 6898391779 is 9771938986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6898391779 - 2¹⁹ = 6897867491 is a prime.

It is not a weakly prime, because it can be changed into another prime (6898398779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449195889 + 3449195890.

It is an arithmetic number, because the mean of its divisors is an integer number (3449195890).

Almost surely, 2^6898391779 is an apocalyptic number.

6898391779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6898391779 is an equidigital number, since it uses as much as digits as its factorization.

6898391779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 67.

The square root of 6898391779 is about 83056.5577121999. The cubic root of 6898391779 is about 1903.6303424425.

The spelling of 6898391779 in words is "six billion, eight hundred ninety-eight million, three hundred ninety-one thousand, seven hundred seventy-nine".