998305193857025 has 6 divisors (see below), whose sum is σ = 1237898440382742. Its totient is φ = 798644155085600.

The previous prime is 998305193856983. The next prime is 998305193857117. The reversal of 998305193857025 is 520758391503899.

It is a Cunningham number, because it is equal to 31595968²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 998305193857024 = 1^2 + 31595968^2 .

It is not a de Polignac number, because 998305193857025 - 2¹⁰ = 998305193856001 is a prime.

It is a super-2 number, since 2×998305193857025² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19966103877116 + ... + 19966103877165.

It is an arithmetic number, because the mean of its divisors is an integer number (206316406730457).

Almost surely, 2^{998305193857025} is an apocalyptic number.

It is an amenable number.

998305193857025 is a deficient number, since it is larger than the sum of its proper divisors (239593246525717).

998305193857025 is a wasteful number, since it uses less digits than its factorization.

998305193857025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39932207754291 (or 39932207754286 counting only the distinct ones).

The product of its (nonzero) digits is 734832000, while the sum is 74.

The spelling of 998305193857025 in words is "nine hundred ninety-eight trillion, three hundred five billion, one hundred ninety-three million, eight hundred fifty-seven thousand, twenty-five".