665323323566 has 16 divisors (see below), whose sum is σ = 1091795072688. Its totient is φ = 301562976000.

The previous prime is 665323323523. The next prime is 665323323593.

665323323566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42827885 + ... + 42843416.

It is an arithmetic number, because the mean of its divisors is an integer number (68237192043).

Almost surely, 2^665323323566 is an apocalyptic number.

665323323566 is a deficient number, since it is larger than the sum of its proper divisors (426471749122).

665323323566 is a wasteful number, since it uses less digits than its factorization.

665323323566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85671667.

The product of its digits is 10497600, while the sum is 50.

It can be divided in two parts, 665323 and 323566, that added together give a palindrome (988889).

The spelling of 665323323566 in words is "six hundred sixty-five billion, three hundred twenty-three million, three hundred twenty-three thousand, five hundred sixty-six".