6646444213 has 8 divisors (see below), whose sum is σ = 6763128768. Its totient is φ = 6530452704.

The previous prime is 6646444201. The next prime is 6646444243. The reversal of 6646444213 is 3124446466.

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 6646444213 - 2⁹ = 6646443701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646444243) 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, 153895 + ... + 192292.

It is an arithmetic number, because the mean of its divisors is an integer number (845391096).

Almost surely, 2^6646444213 is an apocalyptic number.

It is an amenable number.

6646444213 is a deficient number, since it is larger than the sum of its proper divisors (116684555).

6646444213 is a wasteful number, since it uses less digits than its factorization.

6646444213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346523.

The product of its digits is 331776, while the sum is 40.

The square root of 6646444213 is about 81525.7273073967. The cubic root of 6646444213 is about 1880.1671245913.

The spelling of 6646444213 in words is "six billion, six hundred forty-six million, four hundred forty-four thousand, two hundred thirteen".