666776528 has 20 divisors (see below), whose sum is σ = 1409323488. Its totient is φ = 303080160.

The previous prime is 666776521. The next prime is 666776531. The reversal of 666776528 is 825677666.

It is a self number, because there is not a number n which added to its sum of digits gives 666776528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666776521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1894076 + ... + 1894427.

Almost surely, 2^666776528 is an apocalyptic number.

It is an amenable number.

666776528 is an abundant number, since it is smaller than the sum of its proper divisors (742546960).

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

666776528 is a wasteful number, since it uses less digits than its factorization.

666776528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788522 (or 3788516 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 53.

The square root of 666776528 is about 25822.0163426484. The cubic root of 666776528 is about 873.6284484579.

The spelling of 666776528 in words is "six hundred sixty-six million, seven hundred seventy-six thousand, five hundred twenty-eight".