199900101010991 has 2 divisors, whose sum is σ = 199900101010992. Its totient is φ = 199900101010990.

The previous prime is 199900101010913. The next prime is 199900101011041. The reversal of 199900101010991 is 199010101009991.

It is an a-pointer prime, because the next prime (199900101011041) can be obtained adding 199900101010991 to its sum of digits (50).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199900101010991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199900101010891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99950050505495 + 99950050505496.

It is an arithmetic number, because the mean of its divisors is an integer number (99950050505496).

Almost surely, 2^{199900101010991} is an apocalyptic number.

199900101010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

199900101010991 is an equidigital number, since it uses as much as digits as its factorization.

199900101010991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 50.

The spelling of 199900101010991 in words is "one hundred ninety-nine trillion, nine hundred billion, one hundred one million, ten thousand, nine hundred ninety-one".