9716661881 has 4 divisors (see below), whose sum is σ = 9735752100. Its totient is φ = 9697571664.

The previous prime is 9716661847. The next prime is 9716661887. The reversal of 9716661881 is 1881666179.

9716661881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4272583225 + 5444078656 = 65365^2 + 73784^2 .

It is a cyclic number.

It is not a de Polignac number, because 9716661881 - 2⁶ = 9716661817 is a prime.

It is a super-2 number, since 2×9716661881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9716661887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9544346 + ... + 9545363.

It is an arithmetic number, because the mean of its divisors is an integer number (2433938025).

Almost surely, 2^9716661881 is an apocalyptic number.

It is an amenable number.

9716661881 is a deficient number, since it is larger than the sum of its proper divisors (19090219).

9716661881 is a wasteful number, since it uses less digits than its factorization.

9716661881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19090218.

The product of its digits is 870912, while the sum is 53.

The square root of 9716661881 is about 98573.1296094428. The cubic root of 9716661881 is about 2133.8916474555.

The spelling of 9716661881 in words is "nine billion, seven hundred sixteen million, six hundred sixty-one thousand, eight hundred eighty-one".