6666446643 has 8 divisors (see below), whose sum is σ = 8905658256. Its totient is φ = 4435766400.

The previous prime is 6666446627. The next prime is 6666446653. The reversal of 6666446643 is 3466446666.

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

It is not a de Polignac number, because 6666446643 - 2⁴ = 6666446627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6666446653) 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 7 ways as a sum of consecutive naturals, for example, 2131018 + ... + 2134143.

It is an arithmetic number, because the mean of its divisors is an integer number (1113207282).

Almost surely, 2^6666446643 is an apocalyptic number.

6666446643 is a deficient number, since it is larger than the sum of its proper divisors (2239211613).

6666446643 is a wasteful number, since it uses less digits than its factorization.

6666446643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265685.

The product of its digits is 8957952, while the sum is 51.

The square root of 6666446643 is about 81648.3107173688. The cubic root of 6666446643 is about 1882.0513525145.

The spelling of 6666446643 in words is "six billion, six hundred sixty-six million, four hundred forty-six thousand, six hundred forty-three".