6555180221 has 8 divisors (see below), whose sum is σ = 6762545664. Its totient is φ = 6349404240.

The previous prime is 6555180217. The next prime is 6555180227. The reversal of 6555180221 is 1220815556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6555180221 - 2² = 6555180217 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 (6555180227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388985 + ... + 405486.

It is an arithmetic number, because the mean of its divisors is an integer number (845318208).

Almost surely, 2^6555180221 is an apocalyptic number.

It is an amenable number.

6555180221 is a deficient number, since it is larger than the sum of its proper divisors (207365443).

6555180221 is a wasteful number, since it uses less digits than its factorization.

6555180221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794731.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 6555180221 is about 80964.0674682294. The cubic root of 6555180221 is about 1871.5217503373.

Adding to 6555180221 its reverse (1220815556), we get a palindrome (7775995777).

The spelling of 6555180221 in words is "six billion, five hundred fifty-five million, one hundred eighty thousand, two hundred twenty-one".