6564999909 has 64 divisors (see below), whose sum is σ = 10214265600. Its totient is φ = 3715891200.

The previous prime is 6564999907. The next prime is 6564999911. The reversal of 6564999909 is 9099994656.

It is an interprime number because it is at equal distance from previous prime (6564999907) and next prime (6564999911).

It is not a de Polignac number, because 6564999909 - 2¹ = 6564999907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6564999909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564999901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8536677 + ... + 8537445.

It is an arithmetic number, because the mean of its divisors is an integer number (159597900).

Almost surely, 2^6564999909 is an apocalyptic number.

It is an amenable number.

6564999909 is a deficient number, since it is larger than the sum of its proper divisors (3649265691).

6564999909 is a wasteful number, since it uses less digits than its factorization.

6564999909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its (nonzero) digits is 42515280, while the sum is 66.

The square root of 6564999909 is about 81024.6870342614. The cubic root of 6564999909 is about 1872.4557999505.

The spelling of 6564999909 in words is "six billion, five hundred sixty-four million, nine hundred ninety-nine thousand, nine hundred nine".