9866485817 has 4 divisors (see below), whose sum is σ = 9894756900. Its totient is φ = 9838214736.

The previous prime is 9866485793. The next prime is 9866485829. The reversal of 9866485817 is 7185846689.

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 8425220521 + 1441265296 = 91789^2 + 37964^2 .

It is a cyclic number.

It is not a de Polignac number, because 9866485817 - 2⁸ = 9866485561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9866485817.

It is not an unprimeable number, because it can be changed into a prime (9866482817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14135018 + ... + 14135715.

It is an arithmetic number, because the mean of its divisors is an integer number (2473689225).

Almost surely, 2^9866485817 is an apocalyptic number.

It is an amenable number.

9866485817 is a deficient number, since it is larger than the sum of its proper divisors (28271083).

9866485817 is a wasteful number, since it uses less digits than its factorization.

9866485817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28271082.

The product of its digits is 23224320, while the sum is 62.

The square root of 9866485817 is about 99330.1858298876. The cubic root of 9866485817 is about 2144.8034454931.

It can be divided in two parts, 98664 and 85817, that added together give a palindrome (184481).

The spelling of 9866485817 in words is "nine billion, eight hundred sixty-six million, four hundred eighty-five thousand, eight hundred seventeen".