285166565 has 4 divisors (see below), whose sum is σ = 342199884. Its totient is φ = 228133248.

The previous prime is 285166561. The next prime is 285166577. The reversal of 285166565 is 565661582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220492801 + 64673764 = 14849^2 + 8042^2 .

It is a cyclic number.

It is not a de Polignac number, because 285166565 - 2² = 285166561 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 (285166561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28516652 + ... + 28516661.

It is an arithmetic number, because the mean of its divisors is an integer number (85549971).

Almost surely, 2^285166565 is an apocalyptic number.

It is an amenable number.

285166565 is a deficient number, since it is larger than the sum of its proper divisors (57033319).

285166565 is an equidigital number, since it uses as much as digits as its factorization.

285166565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57033318.

The product of its digits is 432000, while the sum is 44.

The square root of 285166565 is about 16886.8755250934. The cubic root of 285166565 is about 658.2126148714.

The spelling of 285166565 in words is "two hundred eighty-five million, one hundred sixty-six thousand, five hundred sixty-five".