9998518155 has 16 divisors (see below), whose sum is σ = 16001793024. Its totient is φ = 5331155040.

The previous prime is 9998518151. The next prime is 9998518169. The reversal of 9998518155 is 5518158999.

It is not a de Polignac number, because 9998518155 - 2² = 9998518151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9998518151) 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 in 15 ways as a sum of consecutive naturals, for example, 25819 + ... + 143748.

It is an arithmetic number, because the mean of its divisors is an integer number (1000112064).

Almost surely, 2^9998518155 is an apocalyptic number.

9998518155 is a deficient number, since it is larger than the sum of its proper divisors (6003274869).

9998518155 is a wasteful number, since it uses less digits than its factorization.

9998518155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173506.

The product of its digits is 5832000, while the sum is 60.

The square root of 9998518155 is about 99992.5905004966. The cubic root of 9998518155 is about 2154.3282668325.

The spelling of 9998518155 in words is "nine billion, nine hundred ninety-eight million, five hundred eighteen thousand, one hundred fifty-five".