665832880 has 120 divisors (see below), whose sum is σ = 1699355520. Its totient is φ = 242319360.

The previous prime is 665832857. The next prime is 665832883. The reversal of 665832880 is 88238566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 665832880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665832883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 716256 + ... + 717184.

It is an arithmetic number, because the mean of its divisors is an integer number (14161296).

Almost surely, 2^665832880 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 665832880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849677760).

665832880 is an abundant number, since it is smaller than the sum of its proper divisors (1033522640).

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

665832880 is a wasteful number, since it uses less digits than its factorization.

665832880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 665832880 is about 25803.7377137499. The cubic root of 665832880 is about 873.2161229305.

The spelling of 665832880 in words is "six hundred sixty-five million, eight hundred thirty-two thousand, eight hundred eighty".