666765528 has 128 divisors (see below), whose sum is σ = 1971406080. Its totient is φ = 185264640.

The previous prime is 666765527. The next prime is 666765559. The reversal of 666765528 is 825567666.

666765528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666765521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 593175 + ... + 594297.

It is an arithmetic number, because the mean of its divisors is an integer number (15401610).

Almost surely, 2^666765528 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 666765528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985703040).

666765528 is an abundant number, since it is smaller than the sum of its proper divisors (1304640552).

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

666765528 is a wasteful number, since it uses less digits than its factorization.

666765528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1325 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 51.

The square root of 666765528 is about 25821.8033452352. The cubic root of 666765528 is about 873.6236442667.

The spelling of 666765528 in words is "six hundred sixty-six million, seven hundred sixty-five thousand, five hundred twenty-eight".