998523159481 has 32 divisors (see below), whose sum is σ = 1069628256000. Its totient is φ = 929454704640.

The previous prime is 998523159457. The next prime is 998523159509. The reversal of 998523159481 is 184951325899.

It is a 4-Lehmer number, since φ(998523159481) divides (998523159481-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 998523159481 - 2¹¹ = 998523157433 is a prime.

It is a super-2 number, since 2×998523159481² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (998523159401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120053935 + ... + 120062251.

It is an arithmetic number, because the mean of its divisors is an integer number (33425883000).

It is a Poulet number, since it divides 2^998523159480-1.

Almost surely, 2^998523159481 is an apocalyptic number.

It is an amenable number.

998523159481 is a deficient number, since it is larger than the sum of its proper divisors (71105096519).

998523159481 is a wasteful number, since it uses less digits than its factorization.

998523159481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8929.

The product of its digits is 27993600, while the sum is 64.

The spelling of 998523159481 in words is "nine hundred ninety-eight billion, five hundred twenty-three million, one hundred fifty-nine thousand, four hundred eighty-one".