199957578811 has 4 divisors (see below), whose sum is σ = 200854249792. Its totient is φ = 199060907832.

The previous prime is 199957578809. The next prime is 199957578839. The reversal of 199957578811 is 118875759991.

199957578811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118875759991 = 16759 ⋅7093249.

It is a cyclic number.

It is not a de Polignac number, because 199957578811 - 2¹ = 199957578809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199957578511) 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 3 ways as a sum of consecutive naturals, for example, 448335156 + ... + 448335601.

It is an arithmetic number, because the mean of its divisors is an integer number (50213562448).

Almost surely, 2^199957578811 is an apocalyptic number.

199957578811 is a deficient number, since it is larger than the sum of its proper divisors (896670981).

199957578811 is an equidigital number, since it uses as much as digits as its factorization.

199957578811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896670980.

The product of its digits is 57153600, while the sum is 70.

The spelling of 199957578811 in words is "one hundred ninety-nine billion, nine hundred fifty-seven million, five hundred seventy-eight thousand, eight hundred eleven".