81112158631392 has 384 divisors, whose sum is σ = 247959552282624. Its totient is φ = 22738244272128.

The previous prime is 81112158631391. The next prime is 81112158631459. The reversal of 81112158631392 is 29313685121118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81112158631391) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7654251438 + ... + 7654262034.

It is an arithmetic number, because the mean of its divisors is an integer number (645728000736).

Almost surely, 2^{81112158631392} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81112158631392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123979776141312).

81112158631392 is an abundant number, since it is smaller than the sum of its proper divisors (166847393651232).

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

81112158631392 is a wasteful number, since it uses less digits than its factorization.

81112158631392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11490 (or 11482 counting only the distinct ones).

The product of its digits is 622080, while the sum is 51.

The spelling of 81112158631392 in words is "eighty-one trillion, one hundred twelve billion, one hundred fifty-eight million, six hundred thirty-one thousand, three hundred ninety-two".