6671021989 has 8 divisors (see below), whose sum is σ = 6902390520. Its totient is φ = 6439742400.

The previous prime is 6671021957. The next prime is 6671021993. The reversal of 6671021989 is 9891201766.

6671021989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46689889 + 6624332100 = 6833^2 + 81390^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6671021989 - 2⁵ = 6671021957 is a prime.

It is a super-2 number, since 2×6671021989² = 89005068755443032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6671021389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154219 + ... + 192679.

It is an arithmetic number, because the mean of its divisors is an integer number (862798815).

Almost surely, 2^6671021989 is an apocalyptic number.

It is an amenable number.

6671021989 is a deficient number, since it is larger than the sum of its proper divisors (231368531).

6671021989 is a wasteful number, since it uses less digits than its factorization.

6671021989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44471.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 6671021989 is about 81676.3245316536. The cubic root of 6671021989 is about 1882.4818200660.

The spelling of 6671021989 in words is "six billion, six hundred seventy-one million, twenty-one thousand, nine hundred eighty-nine".