999663618 has 16 divisors (see below), whose sum is σ = 2001130560. Its totient is φ = 332920656.

The previous prime is 999663589. The next prime is 999663619. The reversal of 999663618 is 816366999.

It is not an unprimeable number, because it can be changed into a prime (999663619) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 67878 + ... + 81281.

It is an arithmetic number, because the mean of its divisors is an integer number (125070660).

Almost surely, 2^999663618 is an apocalyptic number.

999663618 is an abundant number, since it is smaller than the sum of its proper divisors (1001466942).

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

999663618 is a wasteful number, since it uses less digits than its factorization.

999663618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150281.

The product of its digits is 3779136, while the sum is 57.

The square root of 999663618 is about 31617.4574879132. The cubic root of 999663618 is about 999.8878600918.

The spelling of 999663618 in words is "nine hundred ninety-nine million, six hundred sixty-three thousand, six hundred eighteen".