9640558897 has 2 divisors, whose sum is σ = 9640558898. Its totient is φ = 9640558896.

The previous prime is 9640558871. The next prime is 9640558927. The reversal of 9640558897 is 7988550469.

9640558897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9640097856 + 461041 = 98184^2 + 679^2 .

It is an emirp because it is prime and its reverse (7988550469) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9640558897 is a prime.

It is not a weakly prime, because it can be changed into another prime (9640558847) 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 as a sum of consecutive naturals, namely, 4820279448 + 4820279449.

It is an arithmetic number, because the mean of its divisors is an integer number (4820279449).

Almost surely, 2^9640558897 is an apocalyptic number.

It is an amenable number.

9640558897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640558897 is an equidigital number, since it uses as much as digits as its factorization.

9640558897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The square root of 9640558897 is about 98186.3478137363. The cubic root of 9640558897 is about 2128.3060066735.

The spelling of 9640558897 in words is "nine billion, six hundred forty million, five hundred fifty-eight thousand, eight hundred ninety-seven".