81458280543 has 8 divisors (see below), whose sum is σ = 108612663808. Its totient is φ = 54304708824.

The previous prime is 81458280521. The next prime is 81458280551. The reversal of 81458280543 is 34508285418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81458280543 - 2⁵ = 81458280511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81458280492 and 81458280501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81458280593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92946 + ... + 414192.

It is an arithmetic number, because the mean of its divisors is an integer number (13576582976).

Almost surely, 2^81458280543 is an apocalyptic number.

81458280543 is a deficient number, since it is larger than the sum of its proper divisors (27154383265).

81458280543 is a wasteful number, since it uses less digits than its factorization.

81458280543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405773.

The product of its (nonzero) digits is 1228800, while the sum is 48.

The spelling of 81458280543 in words is "eighty-one billion, four hundred fifty-eight million, two hundred eighty thousand, five hundred forty-three".