9611985641 has 2 divisors, whose sum is σ = 9611985642. Its totient is φ = 9611985640.

The previous prime is 9611985611. The next prime is 9611985667. The reversal of 9611985641 is 1465891169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8100720016 + 1511265625 = 90004^2 + 38875^2 .

It is a cyclic number.

It is not a de Polignac number, because 9611985641 - 2³⁰ = 8538243817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9611985641.

It is not a weakly prime, because it can be changed into another prime (9611985611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4805992820 + 4805992821.

It is an arithmetic number, because the mean of its divisors is an integer number (4805992821).

Almost surely, 2^9611985641 is an apocalyptic number.

It is an amenable number.

9611985641 is a deficient number, since it is larger than the sum of its proper divisors (1).

9611985641 is an equidigital number, since it uses as much as digits as its factorization.

9611985641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 9611985641 is about 98040.7346004710. The cubic root of 9611985641 is about 2126.2012596989.

The spelling of 9611985641 in words is "nine billion, six hundred eleven million, nine hundred eighty-five thousand, six hundred forty-one".