285361808069 has 4 divisors (see below), whose sum is σ = 307312716396. Its totient is φ = 263410899744.

The previous prime is 285361808041. The next prime is 285361808071. The reversal of 285361808069 is 960808163582.

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 53532076900 + 231829731169 = 231370^2 + 481487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285361808069 is a prime.

It is a super-2 number, since 2×285361808069² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285361808969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10975454144 + ... + 10975454169.

It is an arithmetic number, because the mean of its divisors is an integer number (76828179099).

Almost surely, 2^285361808069 is an apocalyptic number.

It is an amenable number.

285361808069 is a deficient number, since it is larger than the sum of its proper divisors (21950908327).

285361808069 is a wasteful number, since it uses less digits than its factorization.

285361808069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21950908326.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 285361808069 in words is "two hundred eighty-five billion, three hundred sixty-one million, eight hundred eight thousand, sixty-nine".