81051733384 has 16 divisors (see below), whose sum is σ = 158579478720. Its totient is φ = 38763872400.

The previous prime is 81051733381. The next prime is 81051733421. The reversal of 81051733384 is 48333715018.

It is a self number, because there is not a number n which added to its sum of digits gives 81051733384.

It is not an unprimeable number, because it can be changed into a prime (81051733381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220249092 + ... + 220249459.

It is an arithmetic number, because the mean of its divisors is an integer number (9911217420).

Almost surely, 2^81051733384 is an apocalyptic number.

It is an amenable number.

81051733384 is a deficient number, since it is larger than the sum of its proper divisors (77527745336).

81051733384 is a wasteful number, since it uses less digits than its factorization.

81051733384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440498580 (or 440498576 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 81051733384 in words is "eighty-one billion, fifty-one million, seven hundred thirty-three thousand, three hundred eighty-four".