9681566853 has 24 divisors (see below), whose sum is σ = 15422162592. Its totient is φ = 5382798624.

The previous prime is 9681566849. The next prime is 9681566863. The reversal of 9681566853 is 3586651869.

It is not a de Polignac number, because 9681566853 - 2² = 9681566849 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9681566793 and 9681566802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9681566813) 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 23 ways as a sum of consecutive naturals, for example, 884575 + ... + 895452.

It is an arithmetic number, because the mean of its divisors is an integer number (642590108).

Almost surely, 2^9681566853 is an apocalyptic number.

It is an amenable number.

9681566853 is a deficient number, since it is larger than the sum of its proper divisors (5740595739).

9681566853 is a wasteful number, since it uses less digits than its factorization.

9681566853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780081 (or 1780074 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 57.

The square root of 9681566853 is about 98394.9533919296. The cubic root of 9681566853 is about 2131.3194564522.

The spelling of 9681566853 in words is "nine billion, six hundred eighty-one million, five hundred sixty-six thousand, eight hundred fifty-three".