665365563566 has 32 divisors (see below), whose sum is σ = 1152882333792. Its totient is φ = 284634434560.

The previous prime is 665365563517. The next prime is 665365563659.

665365563566 is nontrivially palindromic in base 10.

665365563566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×665365563566³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 665365563499 and 665365563508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12208970 + ... + 12263346.

It is an arithmetic number, because the mean of its divisors is an integer number (36027572931).

Almost surely, 2^665365563566 is an apocalyptic number.

665365563566 is a deficient number, since it is larger than the sum of its proper divisors (487516770226).

665365563566 is a wasteful number, since it uses less digits than its factorization.

665365563566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87124.

The product of its digits is 262440000, while the sum is 62.

The spelling of 665365563566 in words is "six hundred sixty-five billion, three hundred sixty-five million, five hundred sixty-three thousand, five hundred sixty-six".