665611565111 has 8 divisors (see below), whose sum is σ = 668254628448. Its totient is φ = 662970448000.

The previous prime is 665611565081. The next prime is 665611565117. The reversal of 665611565111 is 111565116566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665611565111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665611565117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200726 + ... + 1171116.

It is an arithmetic number, because the mean of its divisors is an integer number (83531828556).

Almost surely, 2^665611565111 is an apocalyptic number.

665611565111 is a deficient number, since it is larger than the sum of its proper divisors (2643063337).

665611565111 is a wasteful number, since it uses less digits than its factorization.

665611565111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973113.

The product of its digits is 162000, while the sum is 44.

The spelling of 665611565111 in words is "six hundred sixty-five billion, six hundred eleven million, five hundred sixty-five thousand, one hundred eleven".