998427818884815 has 1024 divisors, whose sum is σ = 2291200465305600. Its totient is φ = 405714355200000.

The previous prime is 998427818884789. The next prime is 998427818884817. The reversal of 998427818884815 is 518488818724899.

998427818884815 is a `hidden beast` number, since 9 + 9 + 8 + 4 + 278 + 188 + 84 + 81 + 5 = 666.

It is not a de Polignac number, because 998427818884815 - 2⁹ = 998427818884303 is a prime.

It is a super-3 number, since 3×998427818884815³ (a number of 46 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998427818884817) by changing a digit.

It is a polite number, since it can be written in 1023 ways as a sum of consecutive naturals, for example, 259264557640 + ... + 259264561490.

It is an arithmetic number, because the mean of its divisors is an integer number (2237500454400).

Almost surely, 2^{998427818884815} is an apocalyptic number.

998427818884815 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

998427818884815 is an abundant number, since it is smaller than the sum of its proper divisors (1292772646420785).

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

998427818884815 is a wasteful number, since it uses less digits than its factorization.

998427818884815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337 (or 4331 counting only the distinct ones).

The product of its digits is 23781703680, while the sum is 90.

The spelling of 998427818884815 in words is "nine hundred ninety-eight trillion, four hundred twenty-seven billion, eight hundred eighteen million, eight hundred eighty-four thousand, eight hundred fifteen".