9999998641 has 2 divisors, whose sum is σ = 9999998642. Its totient is φ = 9999998640.

The previous prime is 9999998633. The next prime is 9999998653. The reversal of 9999998641 is 1468999999.

9999998641 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., 9812883600 + 187115041 = 99060^2 + 13679^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999998641 - 2³ = 9999998633 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9999998611) 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, 4999999320 + 4999999321.

It is an arithmetic number, because the mean of its divisors is an integer number (4999999321).

Almost surely, 2^9999998641 is an apocalyptic number.

It is an amenable number.

9999998641 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999998641 is an equidigital number, since it uses as much as digits as its factorization.

9999998641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102036672, while the sum is 73.

The square root of 9999998641 is about 99999.9932049998. The cubic root of 9999998641 is about 2154.4345924360.

The spelling of 9999998641 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred forty-one".