665511132 has 72 divisors (see below), whose sum is σ = 1838211088. Its totient is φ = 186151680.

The previous prime is 665511103. The next prime is 665511149. The reversal of 665511132 is 231115566.

It is a self number, because there is not a number n which added to its sum of digits gives 665511132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1248 + ... + 36504.

Almost surely, 2^665511132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665511132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919105544).

665511132 is an abundant number, since it is smaller than the sum of its proper divisors (1172699956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665511132 is a wasteful number, since it uses less digits than its factorization.

665511132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35299 (or 35286 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 665511132 is about 25797.5024372516. The cubic root of 665511132 is about 873.0754465853.

Adding to 665511132 its reverse (231115566), we get a palindrome (896626698).

The spelling of 665511132 in words is "six hundred sixty-five million, five hundred eleven thousand, one hundred thirty-two".