6689760779 has 4 divisors (see below), whose sum is σ = 7204357776. Its totient is φ = 6175163784.

The previous prime is 6689760761. The next prime is 6689760811. The reversal of 6689760779 is 9770679866.

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 6689760779 - 2³² = 2394793483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6689760719) 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, 257298479 + ... + 257298504.

It is an arithmetic number, because the mean of its divisors is an integer number (1801089444).

Almost surely, 2^6689760779 is an apocalyptic number.

6689760779 is a deficient number, since it is larger than the sum of its proper divisors (514596997).

6689760779 is a wasteful number, since it uses less digits than its factorization.

6689760779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514596996.

The product of its (nonzero) digits is 48009024, while the sum is 65.

The square root of 6689760779 is about 81790.9578070828. The cubic root of 6689760779 is about 1884.2427923050.

The spelling of 6689760779 in words is "six billion, six hundred eighty-nine million, seven hundred sixty thousand, seven hundred seventy-nine".