9998558998 has 4 divisors (see below), whose sum is σ = 14997838500. Its totient is φ = 4999279498.

The previous prime is 9998558989. The next prime is 9998559017. The reversal of 9998558998 is 8998558999.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499639748 + ... + 2499639751.

It is an arithmetic number, because the mean of its divisors is an integer number (3749459625).

Almost surely, 2^9998558998 is an apocalyptic number.

9998558998 is a deficient number, since it is larger than the sum of its proper divisors (4999279502).

9998558998 is a wasteful number, since it uses less digits than its factorization.

9998558998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999279501.

The product of its digits is 755827200, while the sum is 79.

The square root of 9998558998 is about 99992.7947304205. The cubic root of 9998558998 is about 2154.3312002375.

Subtracting from 9998558998 its reverse (8998558999), we obtain a palindrome (999999999).

The spelling of 9998558998 in words is "nine billion, nine hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred ninety-eight".