809743216585 has 32 divisors (see below), whose sum is σ = 1003558849920. Its totient is φ = 626855459328.

The previous prime is 809743216573. The next prime is 809743216643. The reversal of 809743216585 is 585612347908.

It is a cyclic number.

It is not a de Polignac number, because 809743216585 - 2²¹ = 809741119433 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, 11072821 + ... + 11145709.

It is an arithmetic number, because the mean of its divisors is an integer number (31361214060).

It is a 1-persistent number, because it is pandigital, but 2⋅809743216585 = 1619486433170 is not.

Almost surely, 2^809743216585 is an apocalyptic number.

It is an amenable number.

809743216585 is a deficient number, since it is larger than the sum of its proper divisors (193815633335).

809743216585 is a wasteful number, since it uses less digits than its factorization.

809743216585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73417.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 809743216585 in words is "eight hundred nine billion, seven hundred forty-three million, two hundred sixteen thousand, five hundred eighty-five".