998961169899 has 24 divisors (see below), whose sum is σ = 1690264542528. Its totient is φ = 518940866640.

The previous prime is 998961169849. The next prime is 998961169931.

998961169899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 998961169899 - 2²⁰ = 998960121323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998961169849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308891757 + ... + 308894990.

It is an arithmetic number, because the mean of its divisors is an integer number (70427689272).

Almost surely, 2^998961169899 is an apocalyptic number.

998961169899 is a deficient number, since it is larger than the sum of its proper divisors (691303372629).

998961169899 is a wasteful number, since it uses less digits than its factorization.

998961169899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617786775 (or 617786768 counting only the distinct ones).

The product of its digits is 1224440064, while the sum is 84.

The spelling of 998961169899 in words is "nine hundred ninety-eight billion, nine hundred sixty-one million, one hundred sixty-nine thousand, eight hundred ninety-nine".