6565804819 has 4 divisors (see below), whose sum is σ = 7503776944. Its totient is φ = 5627832696.

The previous prime is 6565804813. The next prime is 6565804823. The reversal of 6565804819 is 9184085656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6565804819 - 2²⁷ = 6431587091 is a prime.

It is a super-2 number, since 2×6565804819² = 86219585842407245522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6565804813) 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 3 ways as a sum of consecutive naturals, for example, 468986052 + ... + 468986065.

It is an arithmetic number, because the mean of its divisors is an integer number (1875944236).

Almost surely, 2^6565804819 is an apocalyptic number.

6565804819 is a deficient number, since it is larger than the sum of its proper divisors (937972125).

6565804819 is an equidigital number, since it uses as much as digits as its factorization.

6565804819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937972124.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The square root of 6565804819 is about 81029.6539484157. The cubic root of 6565804819 is about 1872.5323217493.

The spelling of 6565804819 in words is "six billion, five hundred sixty-five million, eight hundred four thousand, eight hundred nineteen".