998262718464 has 480 divisors, whose sum is σ = 3012257203200. Its totient is φ = 291396648960.

The previous prime is 998262718393. The next prime is 998262718499. The reversal of 998262718464 is 464817262899.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 998262718395 and 998262718404.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2780675917 + ... + 2780676275.

It is an arithmetic number, because the mean of its divisors is an integer number (6275535840).

Almost surely, 2^998262718464 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 998262718464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1506128601600).

998262718464 is an abundant number, since it is smaller than the sum of its proper divisors (2013994484736).

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

998262718464 is a wasteful number, since it uses less digits than its factorization.

998262718464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 551 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 66.

The spelling of 998262718464 in words is "nine hundred ninety-eight billion, two hundred sixty-two million, seven hundred eighteen thousand, four hundred sixty-four".