9656650666 has 16 divisors (see below), whose sum is σ = 16137109800. Its totient is φ = 4303228608.

The previous prime is 9656650643. The next prime is 9656650667. The reversal of 9656650666 is 6660566569.

It can be written as a sum of positive squares in 4 ways, for example, as 3466265625 + 6190385041 = 58875^2 + 78679^2 .

It is not an unprimeable number, because it can be changed into a prime (9656650667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6402861 + ... + 6404368.

Almost surely, 2^9656650666 is an apocalyptic number.

9656650666 is a deficient number, since it is larger than the sum of its proper divisors (6480459134).

9656650666 is a wasteful number, since it uses less digits than its factorization.

9656650666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12807273.

The product of its (nonzero) digits is 10497600, while the sum is 55.

The square root of 9656650666 is about 98268.2586901793. The cubic root of 9656650666 is about 2129.4895193458.

The spelling of 9656650666 in words is "nine billion, six hundred fifty-six million, six hundred fifty thousand, six hundred sixty-six".