9885569661 has 12 divisors (see below), whose sum is σ = 15577261440. Its totient is φ = 5991254280.

The previous prime is 9885569611. The next prime is 9885569663. The reversal of 9885569661 is 1669655889.

9885569661 is a `hidden beast` number, since 9 + 8 + 8 + 5 + 569 + 6 + 61 = 666.

It is not a de Polignac number, because 9885569661 - 2⁹ = 9885569149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9885569663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49927021 + ... + 49927218.

It is an arithmetic number, because the mean of its divisors is an integer number (1298105120).

Almost surely, 2^9885569661 is an apocalyptic number.

It is an amenable number.

9885569661 is a deficient number, since it is larger than the sum of its proper divisors (5691691779).

9885569661 is a wasteful number, since it uses less digits than its factorization.

9885569661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99854256 (or 99854253 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 63.

The square root of 9885569661 is about 99426.2020847623. The cubic root of 9885569661 is about 2146.1853874761.

The spelling of 9885569661 in words is "nine billion, eight hundred eighty-five million, five hundred sixty-nine thousand, six hundred sixty-one".