81543115847 has 8 divisors (see below), whose sum is σ = 81746535600. Its totient is φ = 81339793920.

The previous prime is 81543115813. The next prime is 81543115853. The reversal of 81543115847 is 74851134518.

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

It is a cyclic number.

It is not a de Polignac number, because 81543115847 - 2⁶ = 81543115783 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 (81543115897) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1815572 + ... + 1859942.

It is an arithmetic number, because the mean of its divisors is an integer number (10218316950).

Almost surely, 2^81543115847 is an apocalyptic number.

81543115847 is a deficient number, since it is larger than the sum of its proper divisors (203419753).

81543115847 is a wasteful number, since it uses less digits than its factorization.

81543115847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48913.

The product of its digits is 537600, while the sum is 47.

The spelling of 81543115847 in words is "eighty-one billion, five hundred forty-three million, one hundred fifteen thousand, eight hundred forty-seven".