998355486720 has 192 divisors, whose sum is σ = 3241635284160. Its totient is φ = 262254034944.

The previous prime is 998355486719. The next prime is 998355486721. The reversal of 998355486720 is 27684553899.

It is an interprime number because it is at equal distance from previous prime (998355486719) and next prime (998355486721).

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (998355486721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1815714 + ... + 2300766.

It is an arithmetic number, because the mean of its divisors is an integer number (16883517105).

Almost surely, 2^998355486720 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 998355486720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620817642080).

998355486720 is an abundant number, since it is smaller than the sum of its proper divisors (2243279797440).

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

998355486720 is a wasteful number, since it uses less digits than its factorization.

998355486720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485150 (or 485130 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 66.

The spelling of 998355486720 in words is "nine hundred ninety-eight billion, three hundred fifty-five million, four hundred eighty-six thousand, seven hundred twenty".