81007558605585 has 32 divisors (see below), whose sum is σ = 145748539198080. Its totient is φ = 42683500753344.

The previous prime is 81007558605527. The next prime is 81007558605619. The reversal of 81007558605585 is 58550685570018.

81007558605585 is a `hidden beast` number, since 8 + 1 + 0 + 0 + 75 + 5 + 8 + 6 + 0 + 558 + 5 = 666.

It is not a de Polignac number, because 81007558605585 - 2⁹ = 81007558605073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3614783914 + ... + 3614806323.

It is an arithmetic number, because the mean of its divisors is an integer number (4554641849940).

Almost surely, 2^{81007558605585} is an apocalyptic number.

It is an amenable number.

81007558605585 is a deficient number, since it is larger than the sum of its proper divisors (64740980592495).

81007558605585 is a wasteful number, since it uses less digits than its factorization.

81007558605585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7229590334 (or 7229590328 counting only the distinct ones).

The product of its (nonzero) digits is 67200000, while the sum is 63.

The spelling of 81007558605585 in words is "eighty-one trillion, seven billion, five hundred fifty-eight million, six hundred five thousand, five hundred eighty-five".