998849579294117 has 4 divisors (see below), whose sum is σ = 998849643806700. Its totient is φ = 998849514781536.

The previous prime is 998849579294089. The next prime is 998849579294159. The reversal of 998849579294117 is 711492975948899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 450181075635841 + 548668503658276 = 21217471^2 + 23423674^2 .

It is a cyclic number.

It is not a de Polignac number, because 998849579294117 - 2³² = 998845284326821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998849579296117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6451259 + ... + 45158807.

It is an arithmetic number, because the mean of its divisors is an integer number (249712410951675).

It is a Poulet number, since it divides 2^{998849579294116}-1.

Almost surely, 2^{998849579294117} is an apocalyptic number.

998849579294117 is the 25805033-rd pentagonal number.

It is an amenable number.

998849579294117 is a deficient number, since it is larger than the sum of its proper divisors (64512583).

998849579294117 is a wasteful number, since it uses less digits than its factorization.

998849579294117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64512582.

The product of its digits is 29628426240, while the sum is 92.

The spelling of 998849579294117 in words is "nine hundred ninety-eight trillion, eight hundred forty-nine billion, five hundred seventy-nine million, two hundred ninety-four thousand, one hundred seventeen".