665500005566 has 96 divisors (see below), whose sum is σ = 1148709189600. Its totient is φ = 288576288000.

The previous prime is 665500005559. The next prime is 665500005571.

665500005566 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 608874116 + ... + 608875208.

It is an arithmetic number, because the mean of its divisors is an integer number (11965720725).

Almost surely, 2^665500005566 is an apocalyptic number.

665500005566 is a deficient number, since it is larger than the sum of its proper divisors (483209184034).

665500005566 is a wasteful number, since it uses less digits than its factorization.

665500005566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 44.

It can be divided in two parts, 66550000 and 5566, that added together give a palindrome (66555566).

The spelling of 665500005566 in words is "six hundred sixty-five billion, five hundred million, five thousand, five hundred sixty-six".