809954639585281 has 16 divisors (see below), whose sum is σ = 825923931206400. Its totient is φ = 794141388331200.

The previous prime is 809954639585239. The next prime is 809954639585291. The reversal of 809954639585281 is 182585936459908.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809954639585281 is a prime.

It is a super-2 number, since 2×809954639585281² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809954639585195 and 809954639585204.

It is not an unprimeable number, because it can be changed into a prime (809954639585291) by changing a digit.

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, 1187671311 + ... + 1188353083.

It is an arithmetic number, because the mean of its divisors is an integer number (51620245700400).

Almost surely, 2^{809954639585281} is an apocalyptic number.

It is an amenable number.

809954639585281 is a deficient number, since it is larger than the sum of its proper divisors (15969291621119).

809954639585281 is a wasteful number, since it uses less digits than its factorization.

809954639585281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796176.

The product of its (nonzero) digits is 6718464000, while the sum is 82.

The spelling of 809954639585281 in words is "eight hundred nine trillion, nine hundred fifty-four billion, six hundred thirty-nine million, five hundred eighty-five thousand, two hundred eighty-one".