6555621 has 8 divisors (see below), whose sum is σ = 9120960. Its totient is φ = 4180352.

The previous prime is 6555611. The next prime is 6555649. The reversal of 6555621 is 1265556.

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 6555621 - 2¹⁸ = 6293477 is a prime.

6555621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47436 + ... + 47573.

It is an arithmetic number, because the mean of its divisors is an integer number (1140120).

Almost surely, 2^6555621 is an apocalyptic number.

It is an amenable number.

6555621 is a deficient number, since it is larger than the sum of its proper divisors (2565339).

6555621 is a wasteful number, since it uses less digits than its factorization.

6555621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95035.

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

The square root of 6555621 is about 2560.3946961357. The cubic root of 6555621 is about 187.1563697264.

The spelling of 6555621 in words is "six million, five hundred fifty-five thousand, six hundred twenty-one".