81073718078 has 16 divisors (see below), whose sum is σ = 124614047376. Its totient is φ = 39536295360.

The previous prime is 81073718059. The next prime is 81073718087. The reversal of 81073718078 is 87081737018.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 130025 + ... + 423147.

It is an arithmetic number, because the mean of its divisors is an integer number (7788377961).

Almost surely, 2^81073718078 is an apocalyptic number.

81073718078 is a deficient number, since it is larger than the sum of its proper divisors (43540329298).

81073718078 is a wasteful number, since it uses less digits than its factorization.

81073718078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296539.

The product of its (nonzero) digits is 526848, while the sum is 50.

The spelling of 81073718078 in words is "eighty-one billion, seventy-three million, seven hundred eighteen thousand, seventy-eight".