6564666121 has 8 divisors (see below), whose sum is σ = 7077882560. Its totient is φ = 6052627152.

The previous prime is 6564666107. The next prime is 6564666137. The reversal of 6564666121 is 1216664656.

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

It is not a de Polignac number, because 6564666121 - 2⁵ = 6564666089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6564666191) 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, 282765 + ... + 305098.

It is an arithmetic number, because the mean of its divisors is an integer number (884735320).

Almost surely, 2^6564666121 is an apocalyptic number.

It is an amenable number.

6564666121 is a deficient number, since it is larger than the sum of its proper divisors (513216439).

6564666121 is a wasteful number, since it uses less digits than its factorization.

6564666121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588735.

The product of its digits is 311040, while the sum is 43.

The square root of 6564666121 is about 81022.6272161055. The cubic root of 6564666121 is about 1872.4240653032.

The spelling of 6564666121 in words is "six billion, five hundred sixty-four million, six hundred sixty-six thousand, one hundred twenty-one".