665500005567 has 24 divisors (see below), whose sum is σ = 1018028151504. Its totient is φ = 417484687104.

The previous prime is 665500005559. The next prime is 665500005571. The reversal of 665500005567 is 765500005566.

It is not a de Polignac number, because 665500005567 - 2³ = 665500005559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665500005557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330753 + ... + 1200165.

It is an arithmetic number, because the mean of its divisors is an integer number (42417839646).

Almost surely, 2^665500005567 is an apocalyptic number.

665500005567 is a deficient number, since it is larger than the sum of its proper divisors (352528145937).

665500005567 is a wasteful number, since it uses less digits than its factorization.

665500005567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874439 (or 874436 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

Subtracting 665500005567 from its reverse (765500005566), we obtain a palindrome (99999999999).

The spelling of 665500005567 in words is "six hundred sixty-five billion, five hundred million, five thousand, five hundred sixty-seven".