665485584566 has 16 divisors (see below), whose sum is σ = 1088989297920. Its totient is φ = 302489867880.

The previous prime is 665485584563. The next prime is 665485584583.

It is a happy number.

665485584566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665485584496 and 665485584505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665485584563) 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 7 ways as a sum of consecutive naturals, for example, 2897375 + ... + 3118613.

It is an arithmetic number, because the mean of its divisors is an integer number (68061831120).

Almost surely, 2^665485584566 is an apocalyptic number.

665485584566 is a deficient number, since it is larger than the sum of its proper divisors (423503713354).

665485584566 is a wasteful number, since it uses less digits than its factorization.

665485584566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357979.

The product of its digits is 829440000, while the sum is 68.

The spelling of 665485584566 in words is "six hundred sixty-five billion, four hundred eighty-five million, five hundred eighty-four thousand, five hundred sixty-six".