199766459 has 2 divisors, whose sum is σ = 199766460. Its totient is φ = 199766458.

The previous prime is 199766453. The next prime is 199766461. The reversal of 199766459 is 954667991.

It is a strong prime.

It is an emirp because it is prime and its reverse (954667991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199766459 is a prime.

Together with 199766461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199766453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99883229 + 99883230.

It is an arithmetic number, because the mean of its divisors is an integer number (99883230).

Almost surely, 2^199766459 is an apocalyptic number.

199766459 is a deficient number, since it is larger than the sum of its proper divisors (1).

199766459 is an equidigital number, since it uses as much as digits as its factorization.

199766459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 199766459 is about 14133.8762906713. The cubic root of 199766459 is about 584.5758329762.

The spelling of 199766459 in words is "one hundred ninety-nine million, seven hundred sixty-six thousand, four hundred fifty-nine".