6564720909 has 8 divisors (see below), whose sum is σ = 8858418912. Its totient is φ = 4323751760.

The previous prime is 6564720889. The next prime is 6564720917. The reversal of 6564720909 is 9090274656.

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 6564720909 - 2¹² = 6564716813 is a prime.

It is a super-2 number, since 2×6564720909² = 86191121226123572562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564720959) 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, 13181922 + ... + 13182419.

It is an arithmetic number, because the mean of its divisors is an integer number (1107302364).

Almost surely, 2^6564720909 is an apocalyptic number.

It is an amenable number.

6564720909 is a deficient number, since it is larger than the sum of its proper divisors (2293698003).

6564720909 is a wasteful number, since it uses less digits than its factorization.

6564720909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26364427.

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 6564720909 is about 81022.9653184824. The cubic root of 6564720909 is about 1872.4292743056.

The spelling of 6564720909 in words is "six billion, five hundred sixty-four million, seven hundred twenty thousand, nine hundred nine".