666242312 has 8 divisors (see below), whose sum is σ = 1249204350. Its totient is φ = 333121152.

The previous prime is 666242303. The next prime is 666242323. The reversal of 666242312 is 213242666.

It can be written as a sum of positive squares in only one way, i.e., 664299076 + 1943236 = 25774^2 + 1394^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41640137 + ... + 41640152.

Almost surely, 2^666242312 is an apocalyptic number.

It is an amenable number.

666242312 is a deficient number, since it is larger than the sum of its proper divisors (582962038).

666242312 is a wasteful number, since it uses less digits than its factorization.

666242312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83280295 (or 83280291 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 666242312 is about 25811.6700738251. The cubic root of 666242312 is about 873.3950714210.

Adding to 666242312 its reverse (213242666), we get a palindrome (879484978).

The spelling of 666242312 in words is "six hundred sixty-six million, two hundred forty-two thousand, three hundred twelve".