199986096691 has 2 divisors, whose sum is σ = 199986096692. Its totient is φ = 199986096690.

The previous prime is 199986096659. The next prime is 199986096743. The reversal of 199986096691 is 196690689991.

It is a weak prime.

It is an emirp because it is prime and its reverse (196690689991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 169960986661 and 166689069961.

It is a cyclic number.

It is not a de Polignac number, because 199986096691 - 2⁵ = 199986096659 is a prime.

It is a super-2 number, since 2×199986096691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199986096641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99993048345 + 99993048346.

It is an arithmetic number, because the mean of its divisors is an integer number (99993048346).

Almost surely, 2^199986096691 is an apocalyptic number.

199986096691 is a deficient number, since it is larger than the sum of its proper divisors (1).

199986096691 is an equidigital number, since it uses as much as digits as its factorization.

199986096691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102036672, while the sum is 73.

The spelling of 199986096691 in words is "one hundred ninety-nine billion, nine hundred eighty-six million, ninety-six thousand, six hundred ninety-one".