9999997543 has 2 divisors, whose sum is σ = 9999997544. Its totient is φ = 9999997542.

The previous prime is 9999997537. The next prime is 9999997549. The reversal of 9999997543 is 3457999999.

9999997543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (9999997537) and next prime (9999997549).

It is a cyclic number.

It is not a de Polignac number, because 9999997543 - 2²⁵ = 9966443111 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999997549) 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 as a sum of consecutive naturals, namely, 4999998771 + 4999998772.

It is an arithmetic number, because the mean of its divisors is an integer number (4999998772).

Almost surely, 2^9999997543 is an apocalyptic number.

9999997543 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999997543 is an equidigital number, since it uses as much as digits as its factorization.

9999997543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 223205220, while the sum is 73.

The square root of 9999997543 is about 99999.9877149992. The cubic root of 9999997543 is about 2154.4345135837.

It can be divided in two parts, 999999 and 7543, that multiplied together give a palindrome (7542992457).

The spelling of 9999997543 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, five hundred forty-three".