9666100657681 has 8 divisors (see below), whose sum is σ = 10409831962880. Its totient is φ = 8922395795472.

The previous prime is 9666100657673. The next prime is 9666100657691. The reversal of 9666100657681 is 1867560016669.

9666100657681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9666100657681 - 2³ = 9666100657673 is a prime.

It is a super-2 number, since 2×9666100657681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9666100657601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5848275 + ... + 7316728.

It is an arithmetic number, because the mean of its divisors is an integer number (1301228995360).

Almost surely, 2^{9666100657681} is an apocalyptic number.

It is an amenable number.

9666100657681 is a deficient number, since it is larger than the sum of its proper divisors (743731305199).

9666100657681 is a wasteful number, since it uses less digits than its factorization.

9666100657681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13221495.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 9666100657681 in words is "nine trillion, six hundred sixty-six billion, one hundred million, six hundred fifty-seven thousand, six hundred eighty-one".