665315144 has 48 divisors (see below), whose sum is σ = 1359543600. Its totient is φ = 305083584.

The previous prime is 665315137. The next prime is 665315177. The reversal of 665315144 is 441513566.

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 11 ways as a sum of consecutive naturals, for example, 218867 + ... + 221885.

It is an arithmetic number, because the mean of its divisors is an integer number (28323825).

Almost surely, 2^665315144 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 665315144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679771800).

665315144 is an abundant number, since it is smaller than the sum of its proper divisors (694228456).

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

665315144 is a wasteful number, since it uses less digits than its factorization.

665315144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214 (or 3197 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 665315144 is about 25793.7035727714. The cubic root of 665315144 is about 872.9897334633.

The spelling of 665315144 in words is "six hundred sixty-five million, three hundred fifteen thousand, one hundred forty-four".