6565972779865 has 8 divisors (see below), whose sum is σ = 8012712545280. Its totient is φ = 5163748084272.

The previous prime is 6565972779857. The next prime is 6565972779917. The reversal of 6565972779865 is 5689772795656.

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 6565972779865 - 2³ = 6565972779857 is a prime.

It is a super-2 number, since 2×6565972779865² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11128767129 + ... + 11128767718.

It is an arithmetic number, because the mean of its divisors is an integer number (1001589068160).

Almost surely, 2^{6565972779865} is an apocalyptic number.

It is an amenable number.

6565972779865 is a deficient number, since it is larger than the sum of its proper divisors (1446739765415).

6565972779865 is a wasteful number, since it uses less digits than its factorization.

6565972779865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22257534911.

The product of its digits is 12002256000, while the sum is 82.

The spelling of 6565972779865 in words is "six trillion, five hundred sixty-five billion, nine hundred seventy-two million, seven hundred seventy-nine thousand, eight hundred sixty-five".