6691449379 has 2 divisors, whose sum is σ = 6691449380. Its totient is φ = 6691449378.

The previous prime is 6691449377. The next prime is 6691449383. The reversal of 6691449379 is 9739441966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6691449379 - 2¹ = 6691449377 is a prime.

Together with 6691449377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6691449377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345724689 + 3345724690.

It is an arithmetic number, because the mean of its divisors is an integer number (3345724690).

Almost surely, 2^6691449379 is an apocalyptic number.

6691449379 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691449379 is an equidigital number, since it uses as much as digits as its factorization.

6691449379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 58.

The square root of 6691449379 is about 81801.2798127266. The cubic root of 6691449379 is about 1884.4013163945.

The spelling of 6691449379 in words is "six billion, six hundred ninety-one million, four hundred forty-nine thousand, three hundred seventy-nine".