999998998499 has 2 divisors, whose sum is σ = 999998998500. Its totient is φ = 999998998498.

The previous prime is 999998998489. The next prime is 999998998511. The reversal of 999998998499 is 994899899999.

It is a weak prime.

It is an emirp because it is prime and its reverse (994899899999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999998998499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999998998399 and 999998998408.

It is not a weakly prime, because it can be changed into another prime (999998998459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999499249 + 499999499250.

It is an arithmetic number, because the mean of its divisors is an integer number (499999499250).

Almost surely, 2^999998998499 is an apocalyptic number.

999998998499 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998998499 is an equidigital number, since it uses as much as digits as its factorization.

999998998499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99179645184, while the sum is 101.

The spelling of 999998998499 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety-eight thousand, four hundred ninety-nine".