285184251561 has 48 divisors (see below), whose sum is σ = 432670492800. Its totient is φ = 166762337280.

The previous prime is 285184251533. The next prime is 285184251563. The reversal of 285184251561 is 165152481582.

It is not a de Polignac number, because 285184251561 - 2⁷ = 285184251433 is a prime.

It is a super-3 number, since 3×285184251561³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 285184251561.

It is not an unprimeable number, because it can be changed into a prime (285184251563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16402905 + ... + 16420281.

It is an arithmetic number, because the mean of its divisors is an integer number (9013968600).

Almost surely, 2^285184251561 is an apocalyptic number.

It is an amenable number.

285184251561 is a deficient number, since it is larger than the sum of its proper divisors (147486241239).

285184251561 is a wasteful number, since it uses less digits than its factorization.

285184251561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18990 (or 18979 counting only the distinct ones).

The product of its digits is 768000, while the sum is 48.

The spelling of 285184251561 in words is "two hundred eighty-five billion, one hundred eighty-four million, two hundred fifty-one thousand, five hundred sixty-one".