285685187221 has 16 divisors (see below), whose sum is σ = 345728615040. Its totient is φ = 230451701760.

The previous prime is 285685187197. The next prime is 285685187257. The reversal of 285685187221 is 122781586582.

It is not a de Polignac number, because 285685187221 - 2⁵ = 285685187189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285685287221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1676485 + ... + 1839013.

It is an arithmetic number, because the mean of its divisors is an integer number (21608038440).

Almost surely, 2^285685187221 is an apocalyptic number.

It is an amenable number.

285685187221 is a deficient number, since it is larger than the sum of its proper divisors (60043427819).

285685187221 is a wasteful number, since it uses less digits than its factorization.

285685187221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177324.

The product of its digits is 4300800, while the sum is 55.

The spelling of 285685187221 in words is "two hundred eighty-five billion, six hundred eighty-five million, one hundred eighty-seven thousand, two hundred twenty-one".