6844998991 has 2 divisors, whose sum is σ = 6844998992. Its totient is φ = 6844998990.

The previous prime is 6844998977. The next prime is 6844998997. The reversal of 6844998991 is 1998994486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6844998991 - 2⁷ = 6844998863 is a prime.

It is a super-2 number, since 2×6844998991² = 93708022373582036162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6844998997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3422499495 + 3422499496.

It is an arithmetic number, because the mean of its divisors is an integer number (3422499496).

Almost surely, 2^6844998991 is an apocalyptic number.

6844998991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6844998991 is an equidigital number, since it uses as much as digits as its factorization.

6844998991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40310784, while the sum is 67.

The square root of 6844998991 is about 82734.5090696742. The cubic root of 6844998991 is about 1898.7063207397.

The spelling of 6844998991 in words is "six billion, eight hundred forty-four million, nine hundred ninety-eight thousand, nine hundred ninety-one".