199550726161 has 4 divisors (see below), whose sum is σ = 202076684800. Its totient is φ = 197024767524.

The previous prime is 199550726113. The next prime is 199550726191. The reversal of 199550726161 is 161627055991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199550726161 - 2³⁷ = 62111772689 is a prime.

It is a super-3 number, since 3×199550726161³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199550726099 and 199550726108.

It is not an unprimeable number, because it can be changed into a prime (199550726191) 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 in 3 ways as a sum of consecutive naturals, for example, 1262979201 + ... + 1262979358.

It is an arithmetic number, because the mean of its divisors is an integer number (50519171200).

Almost surely, 2^199550726161 is an apocalyptic number.

It is an amenable number.

199550726161 is a deficient number, since it is larger than the sum of its proper divisors (2525958639).

199550726161 is an equidigital number, since it uses as much as digits as its factorization.

199550726161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525958638.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 199550726161 in words is "one hundred ninety-nine billion, five hundred fifty million, seven hundred twenty-six thousand, one hundred sixty-one".