199542110087 has 2 divisors, whose sum is σ = 199542110088. Its totient is φ = 199542110086.

The previous prime is 199542110063. The next prime is 199542110189. The reversal of 199542110087 is 780011245991.

It is a weak prime.

It is an emirp because it is prime and its reverse (780011245991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199542110087 - 2⁸ = 199542109831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199542116087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99771055043 + 99771055044.

It is an arithmetic number, because the mean of its divisors is an integer number (99771055044).

Almost surely, 2^199542110087 is an apocalyptic number.

199542110087 is a deficient number, since it is larger than the sum of its proper divisors (1).

199542110087 is an equidigital number, since it uses as much as digits as its factorization.

199542110087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 199542110087 in words is "one hundred ninety-nine billion, five hundred forty-two million, one hundred ten thousand, eighty-seven".