66244219 has 2 divisors, whose sum is σ = 66244220. Its totient is φ = 66244218.

The previous prime is 66244201. The next prime is 66244229. The reversal of 66244219 is 91244266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66244219 - 2⁹ = 66243707 is a prime.

It is a super-2 number, since 2×66244219² = 8776593101839922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66244229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33122109 + 33122110.

It is an arithmetic number, because the mean of its divisors is an integer number (33122110).

Almost surely, 2^66244219 is an apocalyptic number.

66244219 is a deficient number, since it is larger than the sum of its proper divisors (1).

66244219 is an equidigital number, since it uses as much as digits as its factorization.

66244219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 66244219 is about 8139.0551662954. The cubic root of 66244219 is about 404.6218468919.

The spelling of 66244219 in words is "sixty-six million, two hundred forty-four thousand, two hundred nineteen".