9656690981966 has 128 divisors (see below), whose sum is σ = 17867038371840. Its totient is φ = 3820674613248.

The previous prime is 9656690981939. The next prime is 9656690981999. The reversal of 9656690981966 is 6691890966569.

9656690981966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1384071470 + ... + 1384078446.

It is an arithmetic number, because the mean of its divisors is an integer number (139586237280).

Almost surely, 2^{9656690981966} is an apocalyptic number.

9656690981966 is a deficient number, since it is larger than the sum of its proper divisors (8210347389874).

9656690981966 is a wasteful number, since it uses less digits than its factorization.

9656690981966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626.

The product of its (nonzero) digits is 2040733440, while the sum is 80.

The spelling of 9656690981966 in words is "nine trillion, six hundred fifty-six billion, six hundred ninety million, nine hundred eighty-one thousand, nine hundred sixty-six".