6564515165 has 16 divisors (see below), whose sum is σ = 8533585200. Its totient is φ = 4847633856.

The previous prime is 6564515161. The next prime is 6564515189. The reversal of 6564515165 is 5615154656.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6418733689 + 145781476 = 80117^2 + 12074^2 .

It is not a de Polignac number, because 6564515165 - 2² = 6564515161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564515161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287810 + ... + 309779.

It is an arithmetic number, because the mean of its divisors is an integer number (533349075).

Almost surely, 2^6564515165 is an apocalyptic number.

6564515165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6564515165 is a deficient number, since it is larger than the sum of its proper divisors (1969070035).

6564515165 is an equidigital number, since it uses as much as digits as its factorization.

6564515165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597633 (or 597607 counting only the distinct ones).

The product of its digits is 540000, while the sum is 44.

The square root of 6564515165 is about 81021.6956438212. The cubic root of 6564515165 is about 1872.4097129199.

The spelling of 6564515165 in words is "six billion, five hundred sixty-four million, five hundred fifteen thousand, one hundred sixty-five".