81351075796 has 24 divisors (see below), whose sum is σ = 145117689696. Its totient is φ = 39896407200.

The previous prime is 81351075779. The next prime is 81351075803. The reversal of 81351075796 is 69757015318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897726 + ... + 984181.

It is an arithmetic number, because the mean of its divisors is an integer number (6046570404).

Almost surely, 2^81351075796 is an apocalyptic number.

It is an amenable number.

81351075796 is a deficient number, since it is larger than the sum of its proper divisors (63766613900).

81351075796 is a wasteful number, since it uses less digits than its factorization.

81351075796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882119 (or 1882117 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 81351075796 in words is "eighty-one billion, three hundred fifty-one million, seventy-five thousand, seven hundred ninety-six".