6689794439 has 4 divisors (see below), whose sum is σ = 6770394456. Its totient is φ = 6609194424.

The previous prime is 6689794429. The next prime is 6689794453. The reversal of 6689794439 is 9344979866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6689794439 - 2⁸ = 6689794183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689794429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40299884 + ... + 40300049.

It is an arithmetic number, because the mean of its divisors is an integer number (1692598614).

Almost surely, 2^6689794439 is an apocalyptic number.

6689794439 is a deficient number, since it is larger than the sum of its proper divisors (80600017).

6689794439 is an equidigital number, since it uses as much as digits as its factorization.

6689794439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80600016.

The product of its digits is 70543872, while the sum is 65.

The square root of 6689794439 is about 81791.1635752909. The cubic root of 6689794439 is about 1884.2459525329.

The spelling of 6689794439 in words is "six billion, six hundred eighty-nine million, seven hundred ninety-four thousand, four hundred thirty-nine".