199863368991 has 48 divisors (see below), whose sum is σ = 342658811040. Its totient is φ = 110658908160.

The previous prime is 199863368987. The next prime is 199863369001.

199863368991 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 199863368991 - 2² = 199863368987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199863368911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 675646 + ... + 925323.

It is an arithmetic number, because the mean of its divisors is an integer number (7138725230).

Almost surely, 2^199863368991 is an apocalyptic number.

199863368991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199863368991 is a deficient number, since it is larger than the sum of its proper divisors (142795442049).

199863368991 is a wasteful number, since it uses less digits than its factorization.

199863368991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601096 (or 1601093 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 72.

The spelling of 199863368991 in words is "one hundred ninety-nine billion, eight hundred sixty-three million, three hundred sixty-eight thousand, nine hundred ninety-one".