665285582566 has 32 divisors (see below), whose sum is σ = 1099682731296. Its totient is φ = 299339040000.

The previous prime is 665285582551. The next prime is 665285582567.

665285582566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665285582498 and 665285582507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665285582567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10235466 + ... + 10300258.

It is an arithmetic number, because the mean of its divisors is an integer number (34365085353).

Almost surely, 2^665285582566 is an apocalyptic number.

665285582566 is a deficient number, since it is larger than the sum of its proper divisors (434397148730).

665285582566 is a wasteful number, since it uses less digits than its factorization.

665285582566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69528.

The product of its digits is 207360000, while the sum is 64.

The spelling of 665285582566 in words is "six hundred sixty-five billion, two hundred eighty-five million, five hundred eighty-two thousand, five hundred sixty-six".