6616321 has 8 divisors (see below), whose sum is σ = 6874920. Its totient is φ = 6359808.

The previous prime is 6616301. The next prime is 6616339. The reversal of 6616321 is 1236166.

It can be written as a sum of positive squares in 4 ways, for example, as 2356225 + 4260096 = 1535^2 + 2064^2 .

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 6616321 - 2⁵ = 6616289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6616301) 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, 9435 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (859365).

Almost surely, 2^6616321 is an apocalyptic number.

It is an amenable number.

6616321 is a deficient number, since it is larger than the sum of its proper divisors (258599).

6616321 is a wasteful number, since it uses less digits than its factorization.

6616321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 1296, while the sum is 25.

The square root of 6616321 is about 2572.2210247177. The cubic root of 6616321 is about 187.7322372695.

The spelling of 6616321 in words is "six million, six hundred sixteen thousand, three hundred twenty-one".