9788853661 has 2 divisors, whose sum is σ = 9788853662. Its totient is φ = 9788853660.

The previous prime is 9788853647. The next prime is 9788853703. The reversal of 9788853661 is 1663588879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9543336100 + 245517561 = 97690^2 + 15669^2 .

It is a cyclic number.

It is not a de Polignac number, because 9788853661 - 2¹⁹ = 9788329373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9788853661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9788853161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4894426830 + 4894426831.

It is an arithmetic number, because the mean of its divisors is an integer number (4894426831).

Almost surely, 2^9788853661 is an apocalyptic number.

It is an amenable number.

9788853661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9788853661 is an equidigital number, since it uses as much as digits as its factorization.

9788853661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 61.

The square root of 9788853661 is about 98938.6358355521. The cubic root of 9788853661 is about 2139.1633306756.

The spelling of 9788853661 in words is "nine billion, seven hundred eighty-eight million, eight hundred fifty-three thousand, six hundred sixty-one".