6998779019 has 2 divisors, whose sum is σ = 6998779020. Its totient is φ = 6998779018.

The previous prime is 6998778959. The next prime is 6998779027. The reversal of 6998779019 is 9109778996.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6998779019 is a prime.

It is a super-2 number, since 2×6998779019² = 97965815513589204722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6998779049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499389509 + 3499389510.

It is an arithmetic number, because the mean of its divisors is an integer number (3499389510).

Almost surely, 2^6998779019 is an apocalyptic number.

6998779019 is a deficient number, since it is larger than the sum of its proper divisors (1).

6998779019 is an equidigital number, since it uses as much as digits as its factorization.

6998779019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15431472, while the sum is 65.

The square root of 6998779019 is about 83658.7055780808. The cubic root of 6998779019 is about 1912.8199547514.

The spelling of 6998779019 in words is "six billion, nine hundred ninety-eight million, seven hundred seventy-nine thousand, nineteen".