6643401 has 8 divisors (see below), whose sum is σ = 8873664. Its totient is φ = 4421040.

The previous prime is 6643381. The next prime is 6643411. The reversal of 6643401 is 1043466.

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

It is not a de Polignac number, because 6643401 - 2⁶ = 6643337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6643411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (1109208).

Almost surely, 2^6643401 is an apocalyptic number.

It is an amenable number.

6643401 is a deficient number, since it is larger than the sum of its proper divisors (2230263).

6643401 is a wasteful number, since it uses less digits than its factorization.

6643401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 6643401 is about 2577.4795828483. The cubic root of 6643401 is about 187.9880122883.

Adding to 6643401 its reverse (1043466), we get a palindrome (7686867).

The spelling of 6643401 in words is "six million, six hundred forty-three thousand, four hundred one".