9681661869 has 32 divisors (see below), whose sum is σ = 15224271360. Its totient is φ = 5408596800.

The previous prime is 9681661867. The next prime is 9681661877.

9681661869 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9681661869 - 2¹ = 9681661867 is a prime.

It is a super-2 number, since 2×9681661869² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9681661867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185467 + ... + 231864.

It is an arithmetic number, because the mean of its divisors is an integer number (475758480).

Almost surely, 2^9681661869 is an apocalyptic number.

It is an amenable number.

9681661869 is a deficient number, since it is larger than the sum of its proper divisors (5542609491).

9681661869 is a wasteful number, since it uses less digits than its factorization.

9681661869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417401.

The product of its digits is 6718464, while the sum is 60.

The square root of 9681661869 is about 98395.4362203858. The cubic root of 9681661869 is about 2131.3264287667.

The spelling of 9681661869 in words is "nine billion, six hundred eighty-one million, six hundred sixty-one thousand, eight hundred sixty-nine".