81765875876 has 12 divisors (see below), whose sum is σ = 143225153820. Its totient is φ = 40844403360.

The previous prime is 81765875861. The next prime is 81765875899. The reversal of 81765875876 is 67857856718.

It can be written as a sum of positive squares in 2 ways, for example, as 32847937600 + 48917938276 = 181240^2 + 221174^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9628871 + ... + 9637358.

It is an arithmetic number, because the mean of its divisors is an integer number (11935429485).

Almost surely, 2^81765875876 is an apocalyptic number.

It is an amenable number.

81765875876 is a deficient number, since it is larger than the sum of its proper divisors (61459277944).

81765875876 is a wasteful number, since it uses less digits than its factorization.

81765875876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19267294 (or 19267292 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 68.

The spelling of 81765875876 in words is "eighty-one billion, seven hundred sixty-five million, eight hundred seventy-five thousand, eight hundred seventy-six".