81889304156 has 12 divisors (see below), whose sum is σ = 156334126200. Its totient is φ = 37222410960.

The previous prime is 81889304129. The next prime is 81889304171. The reversal of 81889304156 is 65140398818.

It is a junction number, because it is equal to n+sod(n) for n = 81889304098 and 81889304107.

It is a congruent number.

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, 930560231 + ... + 930560318.

It is an arithmetic number, because the mean of its divisors is an integer number (13027843850).

Almost surely, 2^81889304156 is an apocalyptic number.

It is an amenable number.

81889304156 is a deficient number, since it is larger than the sum of its proper divisors (74444822044).

81889304156 is a wasteful number, since it uses less digits than its factorization.

81889304156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861120564 (or 1861120562 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 81889304156 in words is "eighty-one billion, eight hundred eighty-nine million, three hundred four thousand, one hundred fifty-six".