6686767819 has 4 divisors (see below), whose sum is σ = 6700062096. Its totient is φ = 6673473544.

The previous prime is 6686767783. The next prime is 6686767823. The reversal of 6686767819 is 9187676866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686767819 is a prime.

It is a super-2 number, since 2×6686767819² = 89425727730428033522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6686765819) 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, 6646384 + ... + 6647389.

It is an arithmetic number, because the mean of its divisors is an integer number (1675015524).

Almost surely, 2^6686767819 is an apocalyptic number.

6686767819 is a deficient number, since it is larger than the sum of its proper divisors (13294277).

6686767819 is a wasteful number, since it uses less digits than its factorization.

6686767819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13294276.

The product of its digits is 36578304, while the sum is 64.

The square root of 6686767819 is about 81772.6593611826. The cubic root of 6686767819 is about 1883.9617506393.

The spelling of 6686767819 in words is "six billion, six hundred eighty-six million, seven hundred sixty-seven thousand, eight hundred nineteen".