66894211 has 2 divisors, whose sum is σ = 66894212. Its totient is φ = 66894210.

The previous prime is 66894209. The next prime is 66894227. The reversal of 66894211 is 11249866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66894211 - 2¹ = 66894209 is a prime.

Together with 66894209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66894241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33447105 + 33447106.

It is an arithmetic number, because the mean of its divisors is an integer number (33447106).

Almost surely, 2^66894211 is an apocalyptic number.

66894211 is a deficient number, since it is larger than the sum of its proper divisors (1).

66894211 is an equidigital number, since it uses as much as digits as its factorization.

66894211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 66894211 is about 8178.8881273679. Note that the first 3 decimals coincide. The cubic root of 66894211 is about 405.9409327062.

The spelling of 66894211 in words is "sixty-six million, eight hundred ninety-four thousand, two hundred eleven".