998717339817 has 6 divisors (see below), whose sum is σ = 1442591713082. Its totient is φ = 665811559872.

The previous prime is 998717339813. The next prime is 998717339849. The reversal of 998717339817 is 718933717899.

998717339817 is a `hidden beast` number, since 9 + 98 + 71 + 73 + 398 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 992326776336 + 6390563481 = 996156^2 + 79941^2 .

It is not a de Polignac number, because 998717339817 - 2² = 998717339813 is a prime.

It is a super-2 number, since 2×998717339817² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998717339813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55484296648 + ... + 55484296665.

Almost surely, 2^998717339817 is an apocalyptic number.

It is an amenable number.

998717339817 is a deficient number, since it is larger than the sum of its proper divisors (443874373265).

998717339817 is a wasteful number, since it uses less digits than its factorization.

998717339817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110968593319 (or 110968593316 counting only the distinct ones).

The product of its digits is 144027072, while the sum is 72.

The spelling of 998717339817 in words is "nine hundred ninety-eight billion, seven hundred seventeen million, three hundred thirty-nine thousand, eight hundred seventeen".