998999800009 has 2 divisors, whose sum is σ = 998999800010. Its totient is φ = 998999800008.

The previous prime is 998999799929. The next prime is 998999800037. The reversal of 998999800009 is 900008999899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 779076318409 + 219923481600 = 882653^2 + 468960^2 .

It is an emirp because it is prime and its reverse (900008999899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998999800009 - 2⁷ = 998999799881 is a prime.

It is not a weakly prime, because it can be changed into another prime (998999800109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499499900004 + 499499900005.

It is an arithmetic number, because the mean of its divisors is an integer number (499499900005).

Almost surely, 2^998999800009 is an apocalyptic number.

It is an amenable number.

998999800009 is a deficient number, since it is larger than the sum of its proper divisors (1).

998999800009 is an equidigital number, since it uses as much as digits as its factorization.

998999800009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34012224, while the sum is 70.

The spelling of 998999800009 in words is "nine hundred ninety-eight billion, nine hundred ninety-nine million, eight hundred thousand, nine".