218849995009 has 4 divisors (see below), whose sum is σ = 219191415300. Its totient is φ = 218508574720.

The previous prime is 218849994949. The next prime is 218849995033. The reversal of 218849995009 is 900599948812.

218849995009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157393105984 + 61456889025 = 396728^2 + 247905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218849995009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218849995909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170709184 + ... + 170710465.

It is an arithmetic number, because the mean of its divisors is an integer number (54797853825).

Almost surely, 2^218849995009 is an apocalyptic number.

It is an amenable number.

218849995009 is a deficient number, since it is larger than the sum of its proper divisors (341420291).

218849995009 is an equidigital number, since it uses as much as digits as its factorization.

218849995009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341420290.

The product of its (nonzero) digits is 16796160, while the sum is 64.

The spelling of 218849995009 in words is "two hundred eighteen billion, eight hundred forty-nine million, nine hundred ninety-five thousand, nine".