998632828778317 has 4 divisors (see below), whose sum is σ = 998632893283900. Its totient is φ = 998632764272736.

The previous prime is 998632828778297. The next prime is 998632828778329. The reversal of 998632828778317 is 713877828236899.

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 561502832994601 + 437129995783716 = 23696051^2 + 20907654^2 .

It is a 3-Lehmer number, since φ(998632828778317) divides (998632828778317-1)³.

It is a cyclic number.

It is not a de Polignac number, because 998632828778317 - 2¹⁵ = 998632828745549 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 (998632828778017) 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, 6450559 + ... + 45153907.

It is an arithmetic number, because the mean of its divisors is an integer number (249658223320975).

It is a Poulet number, since it divides 2^{998632828778316}-1.

Almost surely, 2^{998632828778317} is an apocalyptic number.

998632828778317 is the 25802233-rd pentagonal number.

It is an amenable number.

998632828778317 is a deficient number, since it is larger than the sum of its proper divisors (64505583).

998632828778317 is a wasteful number, since it uses less digits than its factorization.

998632828778317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64505582.

The product of its digits is 24580620288, while the sum is 88.

The spelling of 998632828778317 in words is "nine hundred ninety-eight trillion, six hundred thirty-two billion, eight hundred twenty-eight million, seven hundred seventy-eight thousand, three hundred seventeen".