81071063056 has 20 divisors (see below), whose sum is σ = 157450078800. Its totient is φ = 40438784672.

The previous prime is 81071062991. The next prime is 81071063063. The reversal of 81071063056 is 65036017018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6039766 + ... + 6053173.

It is an arithmetic number, because the mean of its divisors is an integer number (7872503940).

Almost surely, 2^81071063056 is an apocalyptic number.

It is an amenable number.

81071063056 is a deficient number, since it is larger than the sum of its proper divisors (76379015744).

81071063056 is a wasteful number, since it uses less digits than its factorization.

81071063056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093366 (or 12093360 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 81071063056 in words is "eighty-one billion, seventy-one million, sixty-three thousand, fifty-six".