81767417715 has 12 divisors (see below), whose sum is σ = 141730190784. Its totient is φ = 43609289424.

The previous prime is 81767417689. The next prime is 81767417723. The reversal of 81767417715 is 51771476718.

It is not a de Polignac number, because 81767417715 - 2⁷ = 81767417587 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 908526819 + ... + 908526908.

It is an arithmetic number, because the mean of its divisors is an integer number (11810849232).

Almost surely, 2^81767417715 is an apocalyptic number.

81767417715 is a deficient number, since it is larger than the sum of its proper divisors (59962773069).

81767417715 is a wasteful number, since it uses less digits than its factorization.

81767417715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817053738 (or 1817053735 counting only the distinct ones).

The product of its digits is 2304960, while the sum is 54.

The spelling of 81767417715 in words is "eighty-one billion, seven hundred sixty-seven million, four hundred seventeen thousand, seven hundred fifteen".