81085048815808 has 28 divisors (see below), whose sum is σ = 160956125079232. Its totient is φ = 40529174780160.

The previous prime is 81085048815761. The next prime is 81085048815829. The reversal of 81085048815808 is 80851884058018.

It is a super-2 number, since 2×81085048815808² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 81085048815808.

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 3 ways as a sum of consecutive naturals, for example, 208392048 + ... + 208780783.

It is an arithmetic number, because the mean of its divisors is an integer number (5748433038544).

Almost surely, 2^{81085048815808} is an apocalyptic number.

It is an amenable number.

81085048815808 is a deficient number, since it is larger than the sum of its proper divisors (79871076263424).

81085048815808 is a wasteful number, since it uses less digits than its factorization.

81085048815808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417175880 (or 417175870 counting only the distinct ones).

The product of its (nonzero) digits is 26214400, while the sum is 64.

The spelling of 81085048815808 in words is "eighty-one trillion, eighty-five billion, forty-eight million, eight hundred fifteen thousand, eight hundred eight".