81797411479719 has 96 divisors (see below), whose sum is σ = 122007618109440. Its totient is φ = 48698997849216.

The previous prime is 81797411479699. The next prime is 81797411479741. The reversal of 81797411479719 is 91797411479718.

It is not a de Polignac number, because 81797411479719 - 2⁸ = 81797411479463 is a prime.

It is a super-2 number, since 2×81797411479719² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81797411479789) 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 95 ways as a sum of consecutive naturals, for example, 2178515104 + ... + 2178552650.

It is an arithmetic number, because the mean of its divisors is an integer number (1270912688640).

Almost surely, 2^{81797411479719} is an apocalyptic number.

81797411479719 is a deficient number, since it is larger than the sum of its proper divisors (40210206629721).

81797411479719 is a wasteful number, since it uses less digits than its factorization.

81797411479719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38789 (or 38776 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 75.

Subtracting 81797411479719 from its reverse (91797411479718), we obtain a palindrome (9999999999999).

The spelling of 81797411479719 in words is "eighty-one trillion, seven hundred ninety-seven billion, four hundred eleven million, four hundred seventy-nine thousand, seven hundred nineteen".