81630096872 has 24 divisors (see below), whose sum is σ = 161536018050. Its totient is φ = 38666886624.

The previous prime is 81630096859. The next prime is 81630096887. The reversal of 81630096872 is 27869003618.

It can be written as a sum of positive squares in only one way, i.e., 44848227076 + 36781869796 = 211774^2 + 191786^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81630096872.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14129747 + ... + 14135522.

Almost surely, 2^81630096872 is an apocalyptic number.

It is an amenable number.

81630096872 is a deficient number, since it is larger than the sum of its proper divisors (79905921178).

81630096872 is a wasteful number, since it uses less digits than its factorization.

81630096872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28265313 (or 28265290 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 81630096872 in words is "eighty-one billion, six hundred thirty million, ninety-six thousand, eight hundred seventy-two".