199916199101 has 2 divisors, whose sum is σ = 199916199102. Its totient is φ = 199916199100.

The previous prime is 199916199083. The next prime is 199916199103. The reversal of 199916199101 is 101991619991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199277424025 + 638775076 = 446405^2 + 25274^2 .

It is an emirp because it is prime and its reverse (101991619991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 101661916661 and 166619166101.

It is a cyclic number.

It is not a de Polignac number, because 199916199101 - 2¹⁰ = 199916198077 is a prime.

Together with 199916199103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199916199103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99958099550 + 99958099551.

It is an arithmetic number, because the mean of its divisors is an integer number (99958099551).

Almost surely, 2^199916199101 is an apocalyptic number.

It is an amenable number.

199916199101 is a deficient number, since it is larger than the sum of its proper divisors (1).

199916199101 is an equidigital number, since it uses as much as digits as its factorization.

199916199101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 56.

The spelling of 199916199101 in words is "one hundred ninety-nine billion, nine hundred sixteen million, one hundred ninety-nine thousand, one hundred one".