81015676791 has 24 divisors (see below), whose sum is σ = 132270497280. Its totient is φ = 43858109232.

The previous prime is 81015676787. The next prime is 81015676873. The reversal of 81015676791 is 19767651018.

It is not a de Polignac number, because 81015676791 - 2² = 81015676787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81015676691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14500551 + ... + 14506136.

It is an arithmetic number, because the mean of its divisors is an integer number (5511270720).

Almost surely, 2^81015676791 is an apocalyptic number.

81015676791 is a deficient number, since it is larger than the sum of its proper divisors (51254820489).

81015676791 is a wasteful number, since it uses less digits than its factorization.

81015676791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29006723 (or 29006716 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 51.

The spelling of 81015676791 in words is "eighty-one billion, fifteen million, six hundred seventy-six thousand, seven hundred ninety-one".