998874478899 has 12 divisors (see below), whose sum is σ = 1573984027512. Its totient is φ = 605378472000.

The previous prime is 998874478859. The next prime is 998874478909.

998874478899 is a `hidden beast` number, since 9 + 9 + 8 + 87 + 447 + 8 + 89 + 9 = 666.

998874478899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 998874478899 - 2¹⁵ = 998874446131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998874478859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5044820502 + ... + 5044820699.

It is an arithmetic number, because the mean of its divisors is an integer number (131165335626).

Almost surely, 2^998874478899 is an apocalyptic number.

998874478899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

998874478899 is a deficient number, since it is larger than the sum of its proper divisors (575109548613).

998874478899 is a wasteful number, since it uses less digits than its factorization.

998874478899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10089641218 (or 10089641215 counting only the distinct ones).

The product of its digits is 21069103104, while the sum is 90.

The spelling of 998874478899 in words is "nine hundred ninety-eight billion, eight hundred seventy-four million, four hundred seventy-eight thousand, eight hundred ninety-nine".