9861644461689 has 24 divisors (see below), whose sum is σ = 14629870781760. Its totient is φ = 6396618130848.

The previous prime is 9861644461673. The next prime is 9861644461717.

9861644461689 is a `hidden beast` number, since 9 + 8 + 6 + 16 + 4 + 446 + 168 + 9 = 666.

9861644461689 is nontrivially palindromic in base 10.

9861644461689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9861644461689 - 2⁴ = 9861644461673 is a prime.

It is a super-2 number, since 2×9861644461689² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9861644461609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18781644 + ... + 19299570.

It is an arithmetic number, because the mean of its divisors is an integer number (609577949240).

Almost surely, 2^{9861644461689} is an apocalyptic number.

It is an amenable number.

9861644461689 is a deficient number, since it is larger than the sum of its proper divisors (4768226320071).

9861644461689 is a wasteful number, since it uses less digits than its factorization.

9861644461689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575149 (or 575146 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 72.

The spelling of 9861644461689 in words is "nine trillion, eight hundred sixty-one billion, six hundred forty-four million, four hundred sixty-one thousand, six hundred eighty-nine".