665530111 has 8 divisors (see below), whose sum is σ = 672123024. Its totient is φ = 658949760.

The previous prime is 665530109. The next prime is 665530121. The reversal of 665530111 is 111035566.

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

It is a cyclic number.

It is not a de Polignac number, because 665530111 - 2¹ = 665530109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665530111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665530121) 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, 130960 + ... + 135946.

It is an arithmetic number, because the mean of its divisors is an integer number (84015378).

Almost surely, 2^665530111 is an apocalyptic number.

665530111 is a deficient number, since it is larger than the sum of its proper divisors (6592913).

665530111 is a wasteful number, since it uses less digits than its factorization.

665530111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6281.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 665530111 is about 25797.8702803158. The cubic root of 665530111 is about 873.0837459412.

Adding to 665530111 its reverse (111035566), we get a palindrome (776565677).

The spelling of 665530111 in words is "six hundred sixty-five million, five hundred thirty thousand, one hundred eleven".