6643653 has 8 divisors (see below), whose sum is σ = 8990688. Its totient is φ = 4362864.

The previous prime is 6643649. The next prime is 6643667. The reversal of 6643653 is 3563466.

It is a happy number.

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

It is not a de Polignac number, because 6643653 - 2² = 6643649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643633) 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, 16326 + ... + 16727.

It is an arithmetic number, because the mean of its divisors is an integer number (1123836).

Almost surely, 2^6643653 is an apocalyptic number.

It is an amenable number.

6643653 is a deficient number, since it is larger than the sum of its proper divisors (2347035).

6643653 is a wasteful number, since it uses less digits than its factorization.

6643653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33123.

The product of its digits is 38880, while the sum is 33.

The square root of 6643653 is about 2577.5284673501. The cubic root of 6643653 is about 187.9903892024.

The spelling of 6643653 in words is "six million, six hundred forty-three thousand, six hundred fifty-three".