66971227 has 2 divisors, whose sum is σ = 66971228. Its totient is φ = 66971226.

The previous prime is 66971213. The next prime is 66971231. The reversal of 66971227 is 72217966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66971227 - 2¹¹ = 66969179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66971227.

It is not a weakly prime, because it can be changed into another prime (66971207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33485613 + 33485614.

It is an arithmetic number, because the mean of its divisors is an integer number (33485614).

Almost surely, 2^66971227 is an apocalyptic number.

66971227 is a deficient number, since it is larger than the sum of its proper divisors (1).

66971227 is an equidigital number, since it uses as much as digits as its factorization.

66971227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 66971227 is about 8183.5949924223. The cubic root of 66971227 is about 406.0966609618.

The spelling of 66971227 in words is "sixty-six million, nine hundred seventy-one thousand, two hundred twenty-seven".