9661659439042 has 16 divisors (see below), whose sum is σ = 15901773302520. Its totient is φ = 4375091066112.

The previous prime is 9661659439001. The next prime is 9661659439057. The reversal of 9661659439042 is 2409349561669.

It is a Cunningham number, because it is equal to 3108321²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 9410899862961 + 250759576081 = 3067719^2 + 500759^2 .

It is a super-2 number, since 2×9661659439042² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3505680567 + ... + 3505683322.

Almost surely, 2^{9661659439042} is an apocalyptic number.

9661659439042 is a deficient number, since it is larger than the sum of its proper divisors (6240113863478).

9661659439042 is a wasteful number, since it uses less digits than its factorization.

9661659439042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011363957.

The product of its (nonzero) digits is 75582720, while the sum is 64.

The spelling of 9661659439042 in words is "nine trillion, six hundred sixty-one billion, six hundred fifty-nine million, four hundred thirty-nine thousand, forty-two".