998558519841 has 15 divisors (see below), whose sum is σ = 1491687273153. Its totient is φ = 665699684220.

The previous prime is 998558519831. The next prime is 998558519857. The reversal of 998558519841 is 148915855899.

The square root of 998558519841 is 999279.

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

It is not a de Polignac number, because 998558519841 - 2³⁷ = 861119566369 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 998558519841.

It is not an unprimeable number, because it can be changed into a prime (998558519821) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 8937996 + ... + 9049026.

Almost surely, 2^998558519841 is an apocalyptic number.

998558519841 is the 999279-th square number.

998558519841 is the 499640-th centered octagonal number.

It is an amenable number.

998558519841 is a deficient number, since it is larger than the sum of its proper divisors (493128753312).

998558519841 is an frugal number, since it uses more digits than its factorization.

998558519841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222074 (or 111034 counting only the distinct ones).

The product of its digits is 186624000, while the sum is 72.

The spelling of 998558519841 in words is "nine hundred ninety-eight billion, five hundred fifty-eight million, five hundred nineteen thousand, eight hundred forty-one".