199996180091 has 2 divisors, whose sum is σ = 199996180092. Its totient is φ = 199996180090.

The previous prime is 199996180081. The next prime is 199996180121. The reversal of 199996180091 is 190081699991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199996180091 - 2²⁶ = 199929071227 is a prime.

It is not a weakly prime, because it can be changed into another prime (199996180081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99998090045 + 99998090046.

It is an arithmetic number, because the mean of its divisors is an integer number (99998090046).

Almost surely, 2^199996180091 is an apocalyptic number.

199996180091 is a deficient number, since it is larger than the sum of its proper divisors (1).

199996180091 is an equidigital number, since it uses as much as digits as its factorization.

199996180091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 62.

The spelling of 199996180091 in words is "one hundred ninety-nine billion, nine hundred ninety-six million, one hundred eighty thousand, ninety-one".