9998888659 has 2 divisors, whose sum is σ = 9998888660. Its totient is φ = 9998888658.

The previous prime is 9998888563. The next prime is 9998888671. The reversal of 9998888659 is 9568888999.

It is a strong prime.

It is an emirp because it is prime and its reverse (9568888999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9998888659 - 2⁷ = 9998888531 is a prime.

It is not a weakly prime, because it can be changed into another prime (9998888059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999444329 + 4999444330.

It is an arithmetic number, because the mean of its divisors is an integer number (4999444330).

Almost surely, 2^9998888659 is an apocalyptic number.

9998888659 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998888659 is an equidigital number, since it uses as much as digits as its factorization.

9998888659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806215680, while the sum is 79.

The square root of 9998888659 is about 99994.4431406066. The cubic root of 9998888659 is about 2154.3548766884.

The spelling of 9998888659 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-eight thousand, six hundred fifty-nine".