81295058585 has 16 divisors (see below), whose sum is σ = 105139339536. Its totient is φ = 59986925568.

The previous prime is 81295058563. The next prime is 81295058617. The reversal of 81295058585 is 58585059218.

It can be written as a sum of positive squares in 8 ways, for example, as 15161735689 + 66133322896 = 123133^2 + 257164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81295058585 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81295058585.

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, 397844 + ... + 566453.

It is an arithmetic number, because the mean of its divisors is an integer number (6571208721).

Almost surely, 2^81295058585 is an apocalyptic number.

It is an amenable number.

81295058585 is a deficient number, since it is larger than the sum of its proper divisors (23844280951).

81295058585 is a wasteful number, since it uses less digits than its factorization.

81295058585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965612.

The product of its (nonzero) digits is 5760000, while the sum is 56.

The spelling of 81295058585 in words is "eighty-one billion, two hundred ninety-five million, fifty-eight thousand, five hundred eighty-five".