991863368199 has 24 divisors (see below), whose sum is σ = 1575853063824. Its totient is φ = 601129306800.

The previous prime is 991863368179. The next prime is 991863368207.

991863368199 is a `hidden beast` number, since 9 + 9 + 18 + 63 + 368 + 199 = 666.

991863368199 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 991863368199 - 2⁷ = 991863368071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991863368129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41388112 + ... + 41412069.

It is an arithmetic number, because the mean of its divisors is an integer number (65660544326).

Almost surely, 2^991863368199 is an apocalyptic number.

991863368199 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

991863368199 is a deficient number, since it is larger than the sum of its proper divisors (583989695625).

991863368199 is a wasteful number, since it uses less digits than its factorization.

991863368199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82800220 (or 82800195 counting only the distinct ones).

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

The spelling of 991863368199 in words is "nine hundred ninety-one billion, eight hundred sixty-three million, three hundred sixty-eight thousand, one hundred ninety-nine".