199454945071 has 2 divisors, whose sum is σ = 199454945072. Its totient is φ = 199454945070.

The previous prime is 199454945021. The next prime is 199454945077. The reversal of 199454945071 is 170549454991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199454945071 - 2¹⁵ = 199454912303 is a prime.

It is a super-2 number, since 2×199454945071² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199454944997 and 199454945015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199454945077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99727472535 + 99727472536.

It is an arithmetic number, because the mean of its divisors is an integer number (99727472536).

Almost surely, 2^199454945071 is an apocalyptic number.

199454945071 is a deficient number, since it is larger than the sum of its proper divisors (1).

199454945071 is an equidigital number, since it uses as much as digits as its factorization.

199454945071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 58.

The spelling of 199454945071 in words is "one hundred ninety-nine billion, four hundred fifty-four million, nine hundred forty-five thousand, seventy-one".