99999998641 has 2 divisors, whose sum is σ = 99999998642. Its totient is φ = 99999998640.

The previous prime is 99999998639. The next prime is 99999998647. The reversal of 99999998641 is 14689999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79705147041 + 20294851600 = 282321^2 + 142460^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999998641 - 2¹ = 99999998639 is a prime.

Together with 99999998639, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (99999998647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999999320 + 49999999321.

It is an arithmetic number, because the mean of its divisors is an integer number (49999999321).

Almost surely, 2^99999998641 is an apocalyptic number.

It is an amenable number.

99999998641 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999998641 is an equidigital number, since it uses as much as digits as its factorization.

99999998641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918330048, while the sum is 82.

The spelling of 99999998641 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred forty-one".