9661659439041 has 21 divisors (see below), whose sum is σ = 14485988336529. Its totient is φ = 6441050342916.

The previous prime is 9661659439001. The next prime is 9661659439057. The reversal of 9661659439041 is 1409349561669.

The square root of 9661659439041 is 3108321.

It is a perfect power (a square), and thus also a powerful number.

9661659439041 is a `hidden beast` number, since 9 + 6 + 6 + 1 + 6 + 594 + 39 + 0 + 4 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-9661659439041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9661659439041.

It is not an unprimeable number, because it can be changed into a prime (9661659439001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 83867106 + ... + 83982228.

Almost surely, 2^{9661659439041} is an apocalyptic number.

9661659439041 is the 3108321-st square number.

9661659439041 is the 1554161-st centered octagonal number.

It is an amenable number.

9661659439041 is a deficient number, since it is larger than the sum of its proper divisors (4824328897488).

9661659439041 is an frugal number, since it uses more digits than its factorization.

9661659439041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230264 (or 115126 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 63.

The spelling of 9661659439041 in words is "nine trillion, six hundred sixty-one billion, six hundred fifty-nine million, four hundred thirty-nine thousand, forty-one".