6658221 has 8 divisors (see below), whose sum is σ = 8899200. Its totient is φ = 4428032.

The previous prime is 6658193. The next prime is 6658243. The reversal of 6658221 is 1228566.

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 6658221 - 2⁹ = 6657709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6658291) 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, 1125 + ... + 3818.

It is an arithmetic number, because the mean of its divisors is an integer number (1112400).

Almost surely, 2^6658221 is an apocalyptic number.

It is an amenable number.

6658221 is a deficient number, since it is larger than the sum of its proper divisors (2240979).

6658221 is a wasteful number, since it uses less digits than its factorization.

6658221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395.

The product of its digits is 5760, while the sum is 30.

The square root of 6658221 is about 2580.3528828437. The cubic root of 6658221 is about 188.1276954246.

The spelling of 6658221 in words is "six million, six hundred fifty-eight thousand, two hundred twenty-one".