81171384058 has 16 divisors (see below), whose sum is σ = 125109959040. Its totient is φ = 39475963296.

The previous prime is 81171384043. The next prime is 81171384079. The reversal of 81171384058 is 85048317118.

It is a junction number, because it is equal to n+sod(n) for n = 81171383999 and 81171384017.

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, 1954035 + ... + 1995142.

It is an arithmetic number, because the mean of its divisors is an integer number (7819372440).

Almost surely, 2^81171384058 is an apocalyptic number.

81171384058 is a deficient number, since it is larger than the sum of its proper divisors (43938574982).

81171384058 is a wasteful number, since it uses less digits than its factorization.

81171384058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949461.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 81171384058 in words is "eighty-one billion, one hundred seventy-one million, three hundred eighty-four thousand, fifty-eight".