199665227 has 2 divisors, whose sum is σ = 199665228. Its totient is φ = 199665226.

The previous prime is 199665217. The next prime is 199665239. The reversal of 199665227 is 722566991.

It is a weak prime.

It is an emirp because it is prime and its reverse (722566991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199665227 - 2¹² = 199661131 is a prime.

It is a super-3 number, since 3×199665227³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199665217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99832613 + 99832614.

It is an arithmetic number, because the mean of its divisors is an integer number (99832614).

Almost surely, 2^199665227 is an apocalyptic number.

199665227 is a deficient number, since it is larger than the sum of its proper divisors (1).

199665227 is an equidigital number, since it uses as much as digits as its factorization.

199665227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 199665227 is about 14130.2946536865. The cubic root of 199665227 is about 584.4770713523.

The spelling of 199665227 in words is "one hundred ninety-nine million, six hundred sixty-five thousand, two hundred twenty-seven".