6656321 has 16 divisors (see below), whose sum is σ = 7879680. Its totient is φ = 5505360.

The previous prime is 6656311. The next prime is 6656339. The reversal of 6656321 is 1236566.

It is not a de Polignac number, because 6656321 - 2⁶ = 6656257 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 (6656311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29210 + ... + 29436.

It is an arithmetic number, because the mean of its divisors is an integer number (492480).

Almost surely, 2^6656321 is an apocalyptic number.

It is an amenable number.

6656321 is a deficient number, since it is larger than the sum of its proper divisors (1223359).

6656321 is a wasteful number, since it uses less digits than its factorization.

6656321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its digits is 6480, while the sum is 29.

The square root of 6656321 is about 2579.9846898771. The cubic root of 6656321 is about 188.1097989211.

The spelling of 6656321 in words is "six million, six hundred fifty-six thousand, three hundred twenty-one".