81342585422 has 16 divisors (see below), whose sum is σ = 147647046240. Its totient is φ = 32810454528.

The previous prime is 81342585353. The next prime is 81342585449. The reversal of 81342585422 is 22458524318.

It is a congruent number.

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, 170887547 + ... + 170888022.

It is an arithmetic number, because the mean of its divisors is an integer number (9227940390).

Almost surely, 2^81342585422 is an apocalyptic number.

81342585422 is a deficient number, since it is larger than the sum of its proper divisors (66304460818).

81342585422 is a wasteful number, since it uses less digits than its factorization.

81342585422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341775595.

The product of its digits is 614400, while the sum is 44.

The spelling of 81342585422 in words is "eighty-one billion, three hundred forty-two million, five hundred eighty-five thousand, four hundred twenty-two".