66447211 has 2 divisors, whose sum is σ = 66447212. Its totient is φ = 66447210.

The previous prime is 66447209. The next prime is 66447221. The reversal of 66447211 is 11274466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66447211 - 2¹ = 66447209 is a prime.

Together with 66447209, it forms a pair of twin primes.

It is equal to p_3921097 and since 66447211 and 3921097 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66447221) 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, 33223605 + 33223606.

It is an arithmetic number, because the mean of its divisors is an integer number (33223606).

Almost surely, 2^66447211 is an apocalyptic number.

66447211 is a deficient number, since it is larger than the sum of its proper divisors (1).

66447211 is an equidigital number, since it uses as much as digits as its factorization.

66447211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 66447211 is about 8151.5158712966. The cubic root of 66447211 is about 405.0347193728.

The spelling of 66447211 in words is "sixty-six million, four hundred forty-seven thousand, two hundred eleven".