199981101611 has 2 divisors, whose sum is σ = 199981101612. Its totient is φ = 199981101610.

The previous prime is 199981101583. The next prime is 199981101613. The reversal of 199981101611 is 116101189991.

It is a strong prime.

It is an emirp because it is prime and its reverse (116101189991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 119101186661 and 166681101911.

It is a cyclic number.

It is not a de Polignac number, because 199981101611 - 2⁶ = 199981101547 is a prime.

Together with 199981101613, 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 (199981101613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99990550805 + 99990550806.

It is an arithmetic number, because the mean of its divisors is an integer number (99990550806).

Almost surely, 2^199981101611 is an apocalyptic number.

199981101611 is a deficient number, since it is larger than the sum of its proper divisors (1).

199981101611 is an equidigital number, since it uses as much as digits as its factorization.

199981101611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 47.

The spelling of 199981101611 in words is "one hundred ninety-nine billion, nine hundred eighty-one million, one hundred one thousand, six hundred eleven".