998509985952 has 96 divisors (see below), whose sum is σ = 2685418287552. Its totient is φ = 324687304704.

The previous prime is 998509985947. The next prime is 998509985971. The reversal of 998509985952 is 259589905899.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3138268 + ... + 3441764.

It is an arithmetic number, because the mean of its divisors is an integer number (27973107162).

Almost surely, 2^998509985952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998509985952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342709143776).

998509985952 is an abundant number, since it is smaller than the sum of its proper divisors (1686908301600).

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

998509985952 is a wasteful number, since it uses less digits than its factorization.

998509985952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304350 (or 304342 counting only the distinct ones).

The product of its (nonzero) digits is 944784000, while the sum is 78.

The spelling of 998509985952 in words is "nine hundred ninety-eight billion, five hundred nine million, nine hundred eighty-five thousand, nine hundred fifty-two".