81961713854776 has 16 divisors (see below), whose sum is σ = 175632243974640. Its totient is φ = 35126448794880.

The previous prime is 81961713854767. The next prime is 81961713854791. The reversal of 81961713854776 is 67745831716918.

It is a super-2 number, since 2×81961713854776² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81961713854699 and 81961713854708.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 731801016505 + ... + 731801016616.

It is an arithmetic number, because the mean of its divisors is an integer number (10977015248415).

Almost surely, 2^{81961713854776} is an apocalyptic number.

It is an amenable number.

81961713854776 is an abundant number, since it is smaller than the sum of its proper divisors (93670530119864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81961713854776 is a wasteful number, since it uses less digits than its factorization.

81961713854776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463602033134 (or 1463602033130 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 73.

The spelling of 81961713854776 in words is "eighty-one trillion, nine hundred sixty-one billion, seven hundred thirteen million, eight hundred fifty-four thousand, seven hundred seventy-six".