81316843224 has 16 divisors (see below), whose sum is σ = 203292108120. Its totient is φ = 27105614400.

The previous prime is 81316843217. The next prime is 81316843259. The reversal of 81316843224 is 42234861318.

It is a super-2 number, since 2×81316843224² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694100877 + ... + 1694100924.

Almost surely, 2^81316843224 is an apocalyptic number.

It is an amenable number.

81316843224 is an abundant number, since it is smaller than the sum of its proper divisors (121975264896).

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

81316843224 is a wasteful number, since it uses less digits than its factorization.

81316843224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388201810 (or 3388201806 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The spelling of 81316843224 in words is "eighty-one billion, three hundred sixteen million, eight hundred forty-three thousand, two hundred twenty-four".