81334807532 has 18 divisors (see below), whose sum is σ = 156451872444. Its totient is φ = 36970366840.

The previous prime is 81334807529. The next prime is 81334807553. The reversal of 81334807532 is 23570843318.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84023078 + ... + 84024045.

Almost surely, 2^81334807532 is an apocalyptic number.

It is an amenable number.

81334807532 is a deficient number, since it is larger than the sum of its proper divisors (75117064912).

81334807532 is a wasteful number, since it uses less digits than its factorization.

81334807532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168047149 (or 168047136 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 81334807532 in words is "eighty-one billion, three hundred thirty-four million, eight hundred seven thousand, five hundred thirty-two".