6564999168 has 624 divisors, whose sum is σ = 24806279680. Its totient is φ = 1624375296.

The previous prime is 6564999139. The next prime is 6564999173. The reversal of 6564999168 is 8619994656.

6564999168 is a `hidden beast` number, since 6 + 56 + 499 + 91 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (624).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63737805 + ... + 63737907.

Almost surely, 2^6564999168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6564999168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12403139840).

6564999168 is an abundant number, since it is smaller than the sum of its proper divisors (18241280512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6564999168 is a wasteful number, since it uses less digits than its factorization.

6564999168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 147 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The square root of 6564999168 is about 81024.6824615808. The cubic root of 6564999168 is about 1872.4557295017.

The spelling of 6564999168 in words is "six billion, five hundred sixty-four million, nine hundred ninety-nine thousand, one hundred sixty-eight".