998818866 has 24 divisors (see below), whose sum is σ = 2278008720. Its totient is φ = 315416376.

The previous prime is 998818831. The next prime is 998818871. The reversal of 998818866 is 668818899.

998818866 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1459920 + ... + 1460603.

It is an arithmetic number, because the mean of its divisors is an integer number (94917030).

Almost surely, 2^998818866 is an apocalyptic number.

998818866 is an abundant number, since it is smaller than the sum of its proper divisors (1279189854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998818866 is a wasteful number, since it uses less digits than its factorization.

998818866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920550 (or 2920547 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The square root of 998818866 is about 31604.0957155872. The cubic root of 998818866 is about 999.6061335563.

The spelling of 998818866 in words is "nine hundred ninety-eight million, eight hundred eighteen thousand, eight hundred sixty-six".