81134425794 has 128 divisors (see below), whose sum is σ = 179525009664. Its totient is φ = 24339456000.

The previous prime is 81134425787. The next prime is 81134425829. The reversal of 81134425794 is 49752443118.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 142091529 + ... + 142092099.

It is an arithmetic number, because the mean of its divisors is an integer number (1402539138).

Almost surely, 2^81134425794 is an apocalyptic number.

81134425794 is an abundant number, since it is smaller than the sum of its proper divisors (98390583870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81134425794 is a wasteful number, since it uses less digits than its factorization.

81134425794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252.

The product of its digits is 967680, while the sum is 48.

The spelling of 81134425794 in words is "eighty-one billion, one hundred thirty-four million, four hundred twenty-five thousand, seven hundred ninety-four".