998474056889121 has 16 divisors (see below), whose sum is σ = 1557074552654400. Its totient is φ = 630615193824384.

The previous prime is 998474056889087. The next prime is 998474056889129. The reversal of 998474056889121 is 121988650474899.

998474056889121 is a `hidden beast` number, since 9 + 9 + 8 + 4 + 7 + 40 + 568 + 8 + 9 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 998474056889121 - 2¹⁷ = 998474056758049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998474056889129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973171594896 + ... + 973171595921.

It is an arithmetic number, because the mean of its divisors is an integer number (97317159540900).

Almost surely, 2^{998474056889121} is an apocalyptic number.

It is an amenable number.

998474056889121 is a deficient number, since it is larger than the sum of its proper divisors (558600495765279).

998474056889121 is a wasteful number, since it uses less digits than its factorization.

998474056889121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946343190845 (or 1946343190839 counting only the distinct ones).

The product of its (nonzero) digits is 2508226560, while the sum is 81.

The spelling of 998474056889121 in words is "nine hundred ninety-eight trillion, four hundred seventy-four billion, fifty-six million, eight hundred eighty-nine thousand, one hundred twenty-one".