6535553221 has 8 divisors (see below), whose sum is σ = 6559622784. Its totient is φ = 6511512000.

The previous prime is 6535553203. The next prime is 6535553243. The reversal of 6535553221 is 1223555356.

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 6535553221 - 2¹⁹ = 6535028933 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 (6535553281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527346 + ... + 539596.

It is an arithmetic number, because the mean of its divisors is an integer number (819952848).

Almost surely, 2^6535553221 is an apocalyptic number.

It is an amenable number.

6535553221 is a deficient number, since it is larger than the sum of its proper divisors (24069563).

6535553221 is a wasteful number, since it uses less digits than its factorization.

6535553221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14171.

The product of its digits is 135000, while the sum is 37.

The square root of 6535553221 is about 80842.7685139493. The cubic root of 6535553221 is about 1869.6520291079.

The spelling of 6535553221 in words is "six billion, five hundred thirty-five million, five hundred fifty-three thousand, two hundred twenty-one".