6556352221 has 8 divisors (see below), whose sum is σ = 6587247744. Its totient is φ = 6525487680.

The previous prime is 6556352213. The next prime is 6556352261. The reversal of 6556352221 is 1222536556.

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 6556352221 - 2³ = 6556352213 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 (6556352261) 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, 490590 + ... + 503776.

It is an arithmetic number, because the mean of its divisors is an integer number (823405968).

Almost surely, 2^6556352221 is an apocalyptic number.

It is an amenable number.

6556352221 is a deficient number, since it is larger than the sum of its proper divisors (30895523).

6556352221 is a wasteful number, since it uses less digits than its factorization.

6556352221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15491.

The product of its digits is 108000, while the sum is 37.

The square root of 6556352221 is about 80971.3049234110. The cubic root of 6556352221 is about 1871.6332800848.

Adding to 6556352221 its reverse (1222536556), we get a palindrome (7778888777).

The spelling of 6556352221 in words is "six billion, five hundred fifty-six million, three hundred fifty-two thousand, two hundred twenty-one".