65565875809 has 8 divisors (see below), whose sum is σ = 74934629568. Its totient is φ = 56197672080.

The previous prime is 65565875783. The next prime is 65565875821. The reversal of 65565875809 is 90857856556.

65565875809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65565875809 - 2⁵ = 65565875777 is a prime.

It is a super-2 number, since 2×65565875809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65566875809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161199 + ... + 396379.

It is an arithmetic number, because the mean of its divisors is an integer number (9366828696).

Almost surely, 2^65565875809 is an apocalyptic number.

It is an amenable number.

65565875809 is a deficient number, since it is larger than the sum of its proper divisors (9368753759).

65565875809 is a wasteful number, since it uses less digits than its factorization.

65565875809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275015.

The product of its (nonzero) digits is 90720000, while the sum is 64.

The spelling of 65565875809 in words is "sixty-five billion, five hundred sixty-five million, eight hundred seventy-five thousand, eight hundred nine".