66212957 has 2 divisors, whose sum is σ = 66212958. Its totient is φ = 66212956.

The previous prime is 66212941. The next prime is 66213029. The reversal of 66212957 is 75921266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65626201 + 586756 = 8101^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 66212957 - 2⁴ = 66212941 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66212957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66212917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106478 + 33106479.

It is an arithmetic number, because the mean of its divisors is an integer number (33106479).

Almost surely, 2^66212957 is an apocalyptic number.

It is an amenable number.

66212957 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212957 is an equidigital number, since it uses as much as digits as its factorization.

66212957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 66212957 is about 8137.1344464744. The cubic root of 66212957 is about 404.5581871054.

The spelling of 66212957 in words is "sixty-six million, two hundred twelve thousand, nine hundred fifty-seven".