115863990543 has 32 divisors (see below), whose sum is σ = 196281336320. Its totient is φ = 66171038400.

The previous prime is 115863990521. The next prime is 115863990547. The reversal of 115863990543 is 345099368511.

115863990543 is a `hidden beast` number, since 1 + 1 + 5 + 8 + 6 + 3 + 9 + 90 + 543 = 666.

It is a Cunningham number, because it is equal to 340388²-1.

It is not a de Polignac number, because 115863990543 - 2⁶ = 115863990479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115863990543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115863990547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170196 + ... + 510582.

It is an arithmetic number, because the mean of its divisors is an integer number (6133791760).

Almost surely, 2^115863990543 is an apocalyptic number.

115863990543 is a deficient number, since it is larger than the sum of its proper divisors (80417345777).

115863990543 is a wasteful number, since it uses less digits than its factorization.

115863990543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342204 (or 342198 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 115863990543 in words is "one hundred fifteen billion, eight hundred sixty-three million, nine hundred ninety thousand, five hundred forty-three".