285351665 has 4 divisors (see below), whose sum is σ = 342422004. Its totient is φ = 228281328.

The previous prime is 285351643. The next prime is 285351701. The reversal of 285351665 is 566153582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566153582 = 2 ⋅283076791.

It can be written as a sum of positive squares in 2 ways, for example, as 130896481 + 154455184 = 11441^2 + 12428^2 .

It is a cyclic number.

It is not a de Polignac number, because 285351665 - 2¹⁰ = 285350641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28535162 + ... + 28535171.

It is an arithmetic number, because the mean of its divisors is an integer number (85605501).

Almost surely, 2^285351665 is an apocalyptic number.

It is an amenable number.

285351665 is a deficient number, since it is larger than the sum of its proper divisors (57070339).

285351665 is an equidigital number, since it uses as much as digits as its factorization.

285351665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57070338.

The product of its digits is 216000, while the sum is 41.

The square root of 285351665 is about 16892.3552235915. The cubic root of 285351665 is about 658.3549980942.

The spelling of 285351665 in words is "two hundred eighty-five million, three hundred fifty-one thousand, six hundred sixty-five".