199996180081 has 2 divisors, whose sum is σ = 199996180082. Its totient is φ = 199996180080.

The previous prime is 199996180019. The next prime is 199996180091. The reversal of 199996180081 is 180081699991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198195026481 + 1801153600 = 445191^2 + 42440^2 .

It is an emirp because it is prime and its reverse (180081699991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 180081966661 and 166669180081.

It is a cyclic number.

It is not a de Polignac number, because 199996180081 - 2²¹ = 199994082929 is a prime.

It is a super-2 number, since 2×199996180081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199996180091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99998090040 + 99998090041.

It is an arithmetic number, because the mean of its divisors is an integer number (99998090041).

Almost surely, 2^199996180081 is an apocalyptic number.

It is an amenable number.

199996180081 is a deficient number, since it is larger than the sum of its proper divisors (1).

199996180081 is an equidigital number, since it uses as much as digits as its factorization.

199996180081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 61.

The spelling of 199996180081 in words is "one hundred ninety-nine billion, nine hundred ninety-six million, one hundred eighty thousand, eighty-one".