285217121285 has 16 divisors (see below), whose sum is σ = 343531393920. Its totient is φ = 227327956800.

The previous prime is 285217121279. The next prime is 285217121347. The reversal of 285217121285 is 582121712582.

It is not a de Polignac number, because 285217121285 - 2²⁸ = 284948685829 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446014 + ... + 1631376.

It is an arithmetic number, because the mean of its divisors is an integer number (21470712120).

Almost surely, 2^285217121285 is an apocalyptic number.

It is an amenable number.

285217121285 is a deficient number, since it is larger than the sum of its proper divisors (58314272635).

285217121285 is a wasteful number, since it uses less digits than its factorization.

285217121285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186508.

The product of its digits is 179200, while the sum is 44.

The spelling of 285217121285 in words is "two hundred eighty-five billion, two hundred seventeen million, one hundred twenty-one thousand, two hundred eighty-five".