81373437068 has 48 divisors (see below), whose sum is σ = 177617664000. Its totient is φ = 31690433280.

The previous prime is 81373437017. The next prime is 81373437091. The reversal of 81373437068 is 86073437318.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 683828 + ... + 793956.

It is an arithmetic number, because the mean of its divisors is an integer number (3700368000).

Almost surely, 2^81373437068 is an apocalyptic number.

It is an amenable number.

81373437068 is an abundant number, since it is smaller than the sum of its proper divisors (96244226932).

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

81373437068 is a wasteful number, since it uses less digits than its factorization.

81373437068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112550 (or 112548 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 81373437068 in words is "eighty-one billion, three hundred seventy-three million, four hundred thirty-seven thousand, sixty-eight".