8285867561 has 4 divisors (see below), whose sum is σ = 8286269892. Its totient is φ = 8285465232.

The previous prime is 8285867539. The next prime is 8285867573. The reversal of 8285867561 is 1657685828.

It is a happy number.

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 1499238400 + 6786629161 = 38720^2 + 82381^2 .

It is a cyclic number.

It is not a de Polignac number, because 8285867561 - 2²⁶ = 8218758697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8285867497 and 8285867506.

It is not an unprimeable number, because it can be changed into a prime (8285867861) 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, 168506 + ... + 212051.

It is an arithmetic number, because the mean of its divisors is an integer number (2071567473).

Almost surely, 2^8285867561 is an apocalyptic number.

It is an amenable number.

8285867561 is a deficient number, since it is larger than the sum of its proper divisors (402331).

8285867561 is a wasteful number, since it uses less digits than its factorization.

8285867561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402330.

The product of its digits is 6451200, while the sum is 56.

The square root of 8285867561 is about 91026.7409116684. The cubic root of 8285867561 is about 2023.5440480679.

The spelling of 8285867561 in words is "eight billion, two hundred eighty-five million, eight hundred sixty-seven thousand, five hundred sixty-one".