998784487899 has 12 divisors (see below), whose sum is σ = 1573842223512. Its totient is φ = 605323932000.

The previous prime is 998784487879. The next prime is 998784487903.

998784487899 is a `hidden beast` number, since 9 + 9 + 8 + 7 + 8 + 448 + 78 + 99 = 666.

998784487899 is nontrivially palindromic in base 10.

998784487899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998784487899 - 2⁵ = 998784487867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998784487829) 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, 5044366002 + ... + 5044366199.

It is an arithmetic number, because the mean of its divisors is an integer number (131153518626).

Almost surely, 2^998784487899 is an apocalyptic number.

998784487899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

998784487899 is a deficient number, since it is larger than the sum of its proper divisors (575057735613).

998784487899 is a wasteful number, since it uses less digits than its factorization.

998784487899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10088732218 (or 10088732215 counting only the distinct ones).

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

The spelling of 998784487899 in words is "nine hundred ninety-eight billion, seven hundred eighty-four million, four hundred eighty-seven thousand, eight hundred ninety-nine".