6643000073 has 8 divisors (see below), whose sum is σ = 6745399848. Its totient is φ = 6540908544.

The previous prime is 6643000061. The next prime is 6643000099. The reversal of 6643000073 is 3700003466.

It can be written as a sum of positive squares in 4 ways, for example, as 3524559424 + 3118440649 = 59368^2 + 55843^2 .

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 6643000073 - 2⁶ = 6643000009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643000373) 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, 33440 + ... + 120017.

It is an arithmetic number, because the mean of its divisors is an integer number (843174981).

Almost surely, 2^6643000073 is an apocalyptic number.

It is an amenable number.

6643000073 is a deficient number, since it is larger than the sum of its proper divisors (102399775).

6643000073 is a wasteful number, since it uses less digits than its factorization.

6643000073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154123.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 6643000073 is about 81504.6015449435. The cubic root of 6643000073 is about 1879.8423054126.

The spelling of 6643000073 in words is "six billion, six hundred forty-three million, seventy-three", and thus it is an aban number.