81942412224 has 28 divisors (see below), whose sum is σ = 216805966184. Its totient is φ = 27314137344.

The previous prime is 81942412219. The next prime is 81942412243. The reversal of 81942412224 is 42221424918.

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 3 ways as a sum of consecutive naturals, for example, 213391507 + ... + 213391890.

Almost surely, 2^81942412224 is an apocalyptic number.

It is an amenable number.

81942412224 is an abundant number, since it is smaller than the sum of its proper divisors (134863553960).

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

81942412224 is a wasteful number, since it uses less digits than its factorization.

81942412224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426783412 (or 426783402 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The spelling of 81942412224 in words is "eighty-one billion, nine hundred forty-two million, four hundred twelve thousand, two hundred twenty-four".