8559803619921 has 4 divisors (see below), whose sum is σ = 11413071493232. Its totient is φ = 5706535746612.

The previous prime is 8559803619919. The next prime is 8559803619931. The reversal of 8559803619921 is 1299163089558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8559803619921 - 2¹ = 8559803619919 is a prime.

It is a super-2 number, since 2×8559803619921² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8559803619911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426633936651 + ... + 1426633936656.

It is an arithmetic number, because the mean of its divisors is an integer number (2853267873308).

Almost surely, 2^{8559803619921} is an apocalyptic number.

It is an amenable number.

8559803619921 is a deficient number, since it is larger than the sum of its proper divisors (2853267873311).

8559803619921 is a wasteful number, since it uses less digits than its factorization.

8559803619921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853267873310.

The product of its (nonzero) digits is 41990400, while the sum is 66.

The spelling of 8559803619921 in words is "eight trillion, five hundred fifty-nine billion, eight hundred three million, six hundred nineteen thousand, nine hundred twenty-one".