665528656 has 80 divisors (see below), whose sum is σ = 1512403200. Its totient is φ = 280917504.

The previous prime is 665528593. The next prime is 665528659. The reversal of 665528656 is 656825566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665528659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111705 + ... + 117511.

It is an arithmetic number, because the mean of its divisors is an integer number (18905040).

Almost surely, 2^665528656 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 665528656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756201600).

665528656 is an abundant number, since it is smaller than the sum of its proper divisors (846874544).

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

665528656 is a wasteful number, since it uses less digits than its factorization.

665528656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876 (or 5870 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 49.

The square root of 665528656 is about 25797.8420802981. The cubic root of 665528656 is about 873.0831096876.

The spelling of 665528656 in words is "six hundred sixty-five million, five hundred twenty-eight thousand, six hundred fifty-six".