81386323312 has 40 divisors (see below), whose sum is σ = 180236679392. Its totient is φ = 34875187200.

The previous prime is 81386323307. The next prime is 81386323321. The reversal of 81386323312 is 21332368318.

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 7 ways as a sum of consecutive naturals, for example, 869512 + ... + 958552.

Almost surely, 2^81386323312 is an apocalyptic number.

It is an amenable number.

81386323312 is an abundant number, since it is smaller than the sum of its proper divisors (98850356080).

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

81386323312 is a wasteful number, since it uses less digits than its factorization.

81386323312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97217 (or 97211 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The spelling of 81386323312 in words is "eighty-one billion, three hundred eighty-six million, three hundred twenty-three thousand, three hundred twelve".