199609193911 has 4 divisors (see below), whose sum is σ = 204251268232. Its totient is φ = 194967119592.

The previous prime is 199609193899. The next prime is 199609193989. The reversal of 199609193911 is 119391906991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199609193911 - 2¹¹ = 199609191863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199609193611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321037096 + ... + 2321037181.

It is an arithmetic number, because the mean of its divisors is an integer number (51062817058).

Almost surely, 2^199609193911 is an apocalyptic number.

199609193911 is a deficient number, since it is larger than the sum of its proper divisors (4642074321).

199609193911 is an equidigital number, since it uses as much as digits as its factorization.

199609193911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642074320.

The product of its (nonzero) digits is 1062882, while the sum is 58.

The spelling of 199609193911 in words is "one hundred ninety-nine billion, six hundred nine million, one hundred ninety-three thousand, nine hundred eleven".