81471523174 has 32 divisors (see below), whose sum is σ = 128510242560. Its totient is φ = 38662585632.

The previous prime is 81471523169. The next prime is 81471523213. The reversal of 81471523174 is 47132517418.

It is a self number, because there is not a number n which added to its sum of digits gives 81471523174.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21143032 + ... + 21146884.

It is an arithmetic number, because the mean of its divisors is an integer number (4015945080).

Almost surely, 2^81471523174 is an apocalyptic number.

81471523174 is a deficient number, since it is larger than the sum of its proper divisors (47038719386).

81471523174 is a wasteful number, since it uses less digits than its factorization.

81471523174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7324.

The product of its digits is 188160, while the sum is 43.

The spelling of 81471523174 in words is "eighty-one billion, four hundred seventy-one million, five hundred twenty-three thousand, one hundred seventy-four".