81540681420876 has 24 divisors (see below), whose sum is σ = 190266333063744. Its totient is φ = 27179549557200.

The previous prime is 81540681420857. The next prime is 81540681420901. The reversal of 81540681420876 is 67802418604518.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84196350 + ... + 85159301.

It is an arithmetic number, because the mean of its divisors is an integer number (7927763877656).

Almost surely, 2^{81540681420876} is an apocalyptic number.

It is an amenable number.

81540681420876 is an abundant number, since it is smaller than the sum of its proper divisors (108725651642868).

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

81540681420876 is a wasteful number, since it uses less digits than its factorization.

81540681420876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169395781 (or 169395779 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 81540681420876 in words is "eighty-one trillion, five hundred forty billion, six hundred eighty-one million, four hundred twenty thousand, eight hundred seventy-six".