6517946221 has 8 divisors (see below), whose sum is σ = 6584767488. Its totient is φ = 6451170000.

The previous prime is 6517946213. The next prime is 6517946231. The reversal of 6517946221 is 1226497156.

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 6517946221 - 2³ = 6517946213 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 (6517946231) 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, 332976 + ... + 352006.

It is an arithmetic number, because the mean of its divisors is an integer number (823095936).

Almost surely, 2^6517946221 is an apocalyptic number.

It is an amenable number.

6517946221 is a deficient number, since it is larger than the sum of its proper divisors (66821267).

6517946221 is a wasteful number, since it uses less digits than its factorization.

6517946221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22523.

The product of its digits is 181440, while the sum is 43.

The square root of 6517946221 is about 80733.7985047155. The cubic root of 6517946221 is about 1867.9715506498.

The spelling of 6517946221 in words is "six billion, five hundred seventeen million, nine hundred forty-six thousand, two hundred twenty-one".