6691799 has 2 divisors, whose sum is σ = 6691800. Its totient is φ = 6691798.

The previous prime is 6691793. The next prime is 6691801. The reversal of 6691799 is 9971966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6691799 is a prime.

Together with 6691801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345899 + 3345900.

It is an arithmetic number, because the mean of its divisors is an integer number (3345900).

Almost surely, 2^6691799 is an apocalyptic number.

6691799 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691799 is an equidigital number, since it uses as much as digits as its factorization.

6691799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 47.

The square root of 6691799 is about 2586.8511746910. The cubic root of 6691799 is about 188.4434135134.

The spelling of 6691799 in words is "six million, six hundred ninety-one thousand, seven hundred ninety-nine".