81543514245 has 32 divisors (see below), whose sum is σ = 131280065280. Its totient is φ = 43220567040.

The previous prime is 81543514207. The next prime is 81543514267. The reversal of 81543514245 is 54241534518.

It is not a de Polignac number, because 81543514245 - 2¹⁰ = 81543513221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81543514197 and 81543514206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1546171 + ... + 1598039.

It is an arithmetic number, because the mean of its divisors is an integer number (4102502040).

Almost surely, 2^81543514245 is an apocalyptic number.

It is an amenable number.

81543514245 is a deficient number, since it is larger than the sum of its proper divisors (49736551035).

81543514245 is a wasteful number, since it uses less digits than its factorization.

81543514245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52525.

The product of its digits is 384000, while the sum is 42.

The spelling of 81543514245 in words is "eighty-one billion, five hundred forty-three million, five hundred fourteen thousand, two hundred forty-five".