998668443556 has 81 divisors (see below), whose sum is σ = 2084996057571. Its totient is φ = 417321878400.

The previous prime is 998668443541. The next prime is 998668443557. The reversal of 998668443556 is 655344866899.

The square root of 998668443556 is 999334.

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 935023245156 + 63645198400 = 966966^2 + 252280^2 .

It is not an unprimeable number, because it can be changed into a prime (998668443557) 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 26 ways as a sum of consecutive naturals, for example, 573616846 + ... + 573618586.

Almost surely, 2^998668443556 is an apocalyptic number.

998668443556 is the 999334-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998668443556

998668443556 is an abundant number, since it is smaller than the sum of its proper divisors (1086327614015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998668443556 is an equidigital number, since it uses as much as digits as its factorization.

998668443556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582 (or 1791 counting only the distinct ones).

The product of its digits is 1343692800, while the sum is 73.

The spelling of 998668443556 in words is "nine hundred ninety-eight billion, six hundred sixty-eight million, four hundred forty-three thousand, five hundred fifty-six".