6820779859 has 4 divisors (see below), whose sum is σ = 6821166616. Its totient is φ = 6820393104.

The previous prime is 6820779857. The next prime is 6820779863. The reversal of 6820779859 is 9589770286.

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 6820779859 - 2¹ = 6820779857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6820779797 and 6820779806.

It is not an unprimeable number, because it can be changed into a prime (6820779853) 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, 165594 + ... + 202639.

It is an arithmetic number, because the mean of its divisors is an integer number (1705291654).

Almost surely, 2^6820779859 is an apocalyptic number.

6820779859 is a deficient number, since it is larger than the sum of its proper divisors (386757).

6820779859 is a wasteful number, since it uses less digits than its factorization.

6820779859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386756.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The square root of 6820779859 is about 82588.0128045227. The cubic root of 6820779859 is about 1896.4643257194.

The spelling of 6820779859 in words is "six billion, eight hundred twenty million, seven hundred seventy-nine thousand, eight hundred fifty-nine".