285785099809 has 12 divisors (see below), whose sum is σ = 319451625360. Its totient is φ = 255401161400.

The previous prime is 285785099801. The next prime is 285785099819. The reversal of 285785099809 is 908990587582.

It is not a de Polignac number, because 285785099809 - 2³ = 285785099801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285785099801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20008627 + ... + 20022904.

It is an arithmetic number, because the mean of its divisors is an integer number (26620968780).

Almost surely, 2^285785099809 is an apocalyptic number.

It is an amenable number.

285785099809 is a deficient number, since it is larger than the sum of its proper divisors (33666525551).

285785099809 is a wasteful number, since it uses less digits than its factorization.

285785099809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40031612 (or 40031601 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 70.

The spelling of 285785099809 in words is "two hundred eighty-five billion, seven hundred eighty-five million, ninety-nine thousand, eight hundred nine".