666755252 has 6 divisors (see below), whose sum is σ = 1166821698. Its totient is φ = 333377624.

The previous prime is 666755251. The next prime is 666755267. The reversal of 666755252 is 252557666.

It can be written as a sum of positive squares in only one way, i.e., 616826896 + 49928356 = 24836^2 + 7066^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666755251) 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 as a sum of consecutive naturals, namely, 83344403 + ... + 83344410.

It is an arithmetic number, because the mean of its divisors is an integer number (194470283).

Almost surely, 2^666755252 is an apocalyptic number.

It is an amenable number.

666755252 is a deficient number, since it is larger than the sum of its proper divisors (500066446).

666755252 is a wasteful number, since it uses less digits than its factorization.

666755252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166688817 (or 166688815 counting only the distinct ones).

The product of its digits is 756000, while the sum is 44.

The square root of 666755252 is about 25821.6043653372. The cubic root of 666755252 is about 873.6191562309.

The spelling of 666755252 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, two hundred fifty-two".