9661866433 has 8 divisors (see below), whose sum is σ = 9930603240. Its totient is φ = 9396689280.

The previous prime is 9661866421. The next prime is 9661866449. The reversal of 9661866433 is 3346681669.

9661866433 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 894727744 + 8767138689 = 29912^2 + 93633^2 .

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 9661866433 - 2³³ = 1071931841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9661866733) 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 7 ways as a sum of consecutive naturals, for example, 884410 + ... + 895267.

It is an arithmetic number, because the mean of its divisors is an integer number (1241325405).

Almost surely, 2^9661866433 is an apocalyptic number.

It is an amenable number.

9661866433 is a deficient number, since it is larger than the sum of its proper divisors (268736807).

9661866433 is a wasteful number, since it uses less digits than its factorization.

9661866433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779827.

The product of its digits is 3359232, while the sum is 52.

The square root of 9661866433 is about 98294.7935192907. The cubic root of 9661866433 is about 2129.8728448710.

The spelling of 9661866433 in words is "nine billion, six hundred sixty-one million, eight hundred sixty-six thousand, four hundred thirty-three".