81537140876 has 12 divisors (see below), whose sum is σ = 143999079840. Its totient is φ = 40394546640.

The previous prime is 81537140849. The next prime is 81537140941. The reversal of 81537140876 is 67804173518.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93505460 + ... + 93506331.

It is an arithmetic number, because the mean of its divisors is an integer number (11999923320).

Almost surely, 2^81537140876 is an apocalyptic number.

It is an amenable number.

81537140876 is a deficient number, since it is larger than the sum of its proper divisors (62461938964).

81537140876 is a wasteful number, since it uses less digits than its factorization.

81537140876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187011904 (or 187011902 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 81537140876 in words is "eighty-one billion, five hundred thirty-seven million, one hundred forty thousand, eight hundred seventy-six".