199975667 has 2 divisors, whose sum is σ = 199975668. Its totient is φ = 199975666.

The previous prime is 199975661. The next prime is 199975669. The reversal of 199975667 is 766579991.

It is a strong prime.

It is an emirp because it is prime and its reverse (766579991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199975667 - 2¹⁶ = 199910131 is a prime.

Together with 199975669, 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 (199975661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99987833 + 99987834.

It is an arithmetic number, because the mean of its divisors is an integer number (99987834).

Almost surely, 2^199975667 is an apocalyptic number.

199975667 is a deficient number, since it is larger than the sum of its proper divisors (1).

199975667 is an equidigital number, since it uses as much as digits as its factorization.

199975667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6429780, while the sum is 59.

The square root of 199975667 is about 14141.2752960969. The cubic root of 199975667 is about 584.7798299728.

The spelling of 199975667 in words is "one hundred ninety-nine million, nine hundred seventy-five thousand, six hundred sixty-seven".