66968212 has 6 divisors (see below), whose sum is σ = 117194378. Its totient is φ = 33484104.

The previous prime is 66968171. The next prime is 66968227. The reversal of 66968212 is 21286966.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 60435076 + 6533136 = 7774^2 + 2556^2 .

It is a congruent number.

It is an unprimeable number.

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, 8371023 + ... + 8371030.

Almost surely, 2^66968212 is an apocalyptic number.

It is an amenable number.

66968212 is a deficient number, since it is larger than the sum of its proper divisors (50226166).

66968212 is a wasteful number, since it uses less digits than its factorization.

66968212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16742057 (or 16742055 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 66968212 is about 8183.4107803531. The cubic root of 66968212 is about 406.0905668034.

The spelling of 66968212 in words is "sixty-six million, nine hundred sixty-eight thousand, two hundred twelve".