199981248543 has 24 divisors (see below), whose sum is σ = 299697169408. Its totient is φ = 133259957784.

The previous prime is 199981248497. The next prime is 199981248557. The reversal of 199981248543 is 345842189991.

199981248543 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 81 + 2 + 4 + 8 + 543 = 666.

It is not a de Polignac number, because 199981248543 - 2¹⁶ = 199981183007 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 (199981248743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 348546 + ... + 722112.

Almost surely, 2^199981248543 is an apocalyptic number.

199981248543 is a deficient number, since it is larger than the sum of its proper divisors (99715920865).

199981248543 is an equidigital number, since it uses as much as digits as its factorization.

199981248543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375785 (or 375773 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The spelling of 199981248543 in words is "one hundred ninety-nine billion, nine hundred eighty-one million, two hundred forty-eight thousand, five hundred forty-three".