6821326866 has 32 divisors (see below), whose sum is σ = 14076014400. Its totient is φ = 2202347520.

The previous prime is 6821326783. The next prime is 6821326903. The reversal of 6821326866 is 6686231286.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65551 + ... + 133938.

It is an arithmetic number, because the mean of its divisors is an integer number (439875450).

Almost surely, 2^6821326866 is an apocalyptic number.

6821326866 is an abundant number, since it is smaller than the sum of its proper divisors (7254687534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6821326866 is a wasteful number, since it uses less digits than its factorization.

6821326866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199674.

The product of its digits is 995328, while the sum is 48.

The square root of 6821326866 is about 82591.3243991159. The cubic root of 6821326866 is about 1896.5150213658.

The spelling of 6821326866 in words is "six billion, eight hundred twenty-one million, three hundred twenty-six thousand, eight hundred sixty-six".