99998663 has 2 divisors, whose sum is σ = 99998664. Its totient is φ = 99998662.

The previous prime is 99998611. The next prime is 99998749. The reversal of 99998663 is 36689999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99998663 - 2¹² = 99994567 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99998603) 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, 49999331 + 49999332.

It is an arithmetic number, because the mean of its divisors is an integer number (49999332).

Almost surely, 2^99998663 is an apocalyptic number.

99998663 is a deficient number, since it is larger than the sum of its proper divisors (1).

99998663 is an equidigital number, since it uses as much as digits as its factorization.

99998663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 59.

The square root of 99998663 is about 9999.9331497766. The cubic root of 99998663 is about 464.1568147506.

The spelling of 99998663 in words is "ninety-nine million, nine hundred ninety-eight thousand, six hundred sixty-three".