9998028985156 has 81 divisors (see below), whose sum is σ = 18775050317751. Its totient is φ = 4657651805184.

The previous prime is 9998028985141. The next prime is 9998028985181. The reversal of 9998028985156 is 6515898208999.

The square root of 9998028985156 is 3161966.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1219845145156 + 8778183840000 = 1104466^2 + 2962800^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12148272961 + ... + 12148273783.

Almost surely, 2^{9998028985156} is an apocalyptic number.

9998028985156 is the 3161966-th square number.

It is an amenable number.

9998028985156 is a deficient number, since it is larger than the sum of its proper divisors (8777021332595).

9998028985156 is an equidigital number, since it uses as much as digits as its factorization.

9998028985156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 1007769600, while the sum is 79.

The spelling of 9998028985156 in words is "nine trillion, nine hundred ninety-eight billion, twenty-eight million, nine hundred eighty-five thousand, one hundred fifty-six".