6821891673 has 16 divisors (see below), whose sum is σ = 9134401536. Its totient is φ = 4528685840.

The previous prime is 6821891669. The next prime is 6821891711. The reversal of 6821891673 is 3761981286.

6821891673 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6821891673 - 2² = 6821891669 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6821891633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081936 + ... + 1088222.

It is an arithmetic number, because the mean of its divisors is an integer number (570900096).

Almost surely, 2^6821891673 is an apocalyptic number.

It is an amenable number.

6821891673 is a deficient number, since it is larger than the sum of its proper divisors (2312509863).

6821891673 is a wasteful number, since it uses less digits than its factorization.

6821891673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7764.

The product of its digits is 870912, while the sum is 51.

The square root of 6821891673 is about 82594.7436160438. The cubic root of 6821891673 is about 1896.5673638410.

The spelling of 6821891673 in words is "six billion, eight hundred twenty-one million, eight hundred ninety-one thousand, six hundred seventy-three".