66550219 has 2 divisors, whose sum is σ = 66550220. Its totient is φ = 66550218.

The previous prime is 66550199. The next prime is 66550241. The reversal of 66550219 is 91205566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66550219 is a prime.

It is a super-2 number, since 2×66550219² = 8857863297895922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66550619) 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, 33275109 + 33275110.

It is an arithmetic number, because the mean of its divisors is an integer number (33275110).

Almost surely, 2^66550219 is an apocalyptic number.

66550219 is a deficient number, since it is larger than the sum of its proper divisors (1).

66550219 is an equidigital number, since it uses as much as digits as its factorization.

66550219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 66550219 is about 8157.8317585005. The cubic root of 66550219 is about 405.2439093695.

The spelling of 66550219 in words is "sixty-six million, five hundred fifty thousand, two hundred nineteen".