199654327081 has 8 divisors (see below), whose sum is σ = 219604760928. Its totient is φ = 181503932500.

The previous prime is 199654327079. The next prime is 199654327109. The reversal of 199654327081 is 180723456991.

It is a happy number.

199654327081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199654327081 - 2¹ = 199654327079 is a prime.

It is a super-4 number, since 4×199654327081⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199654327001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75000295 + ... + 75002956.

It is an arithmetic number, because the mean of its divisors is an integer number (27450595116).

It is a 1-persistent number, because it is pandigital, but 2⋅199654327081 = 399308654162 is not.

Almost surely, 2^199654327081 is an apocalyptic number.

199654327081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199654327081 is a deficient number, since it is larger than the sum of its proper divisors (19950433847).

199654327081 is an equidigital number, since it uses as much as digits as its factorization.

199654327081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150003284 (or 150003262 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 199654327081 in words is "one hundred ninety-nine billion, six hundred fifty-four million, three hundred twenty-seven thousand, eighty-one".