6646441 has 4 divisors (see below), whose sum is σ = 6652800. Its totient is φ = 6640084.

The previous prime is 6646429. The next prime is 6646477. The reversal of 6646441 is 1446466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6646441 - 2⁷ = 6646313 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

6646441 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6640441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201 + ... + 3838.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^6646441 is an apocalyptic number.

It is an amenable number.

6646441 is a deficient number, since it is larger than the sum of its proper divisors (6359).

6646441 is a wasteful number, since it uses less digits than its factorization.

6646441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358.

The product of its digits is 13824, while the sum is 31.

The square root of 6646441 is about 2578.0692387909. The cubic root of 6646441 is about 188.0166821623.

The spelling of 6646441 in words is "six million, six hundred forty-six thousand, four hundred forty-one".