6655521 has 8 divisors (see below), whose sum is σ = 8981280. Its totient is φ = 4383392.

The previous prime is 6655423. The next prime is 6655531. The reversal of 6655521 is 1255566.

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 6655521 - 2⁷ = 6655393 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6655531) 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, 13116 + ... + 13613.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^6655521 is an apocalyptic number.

It is an amenable number.

6655521 is a deficient number, since it is larger than the sum of its proper divisors (2325759).

6655521 is a wasteful number, since it uses less digits than its factorization.

6655521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26815.

The product of its digits is 9000, while the sum is 30.

The square root of 6655521 is about 2579.8296455386. The cubic root of 6655521 is about 188.1022625323.

The spelling of 6655521 in words is "six million, six hundred fifty-five thousand, five hundred twenty-one".