6689705805 has 24 divisors (see below), whose sum is σ = 11703867552. Its totient is φ = 3534496224.

The previous prime is 6689705797. The next prime is 6689705807. The reversal of 6689705805 is 5085079866.

It is not a de Polignac number, because 6689705805 - 2³ = 6689705797 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689705807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 689859 + ... + 699488.

It is an arithmetic number, because the mean of its divisors is an integer number (487661148).

Almost surely, 2^6689705805 is an apocalyptic number.

It is an amenable number.

6689705805 is a deficient number, since it is larger than the sum of its proper divisors (5014161747).

6689705805 is a wasteful number, since it uses less digits than its factorization.

6689705805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389465 (or 1389462 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The square root of 6689705805 is about 81790.6217423489. The cubic root of 6689705805 is about 1884.2376309522.

The spelling of 6689705805 in words is "six billion, six hundred eighty-nine million, seven hundred five thousand, eight hundred five".