218400520017 has 4 divisors (see below), whose sum is σ = 291200693360. Its totient is φ = 145600346676.

The previous prime is 218400520001. The next prime is 218400520031. The reversal of 218400520017 is 710025004812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 218400520017 - 2⁴ = 218400520001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218400520067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36400086667 + ... + 36400086672.

It is an arithmetic number, because the mean of its divisors is an integer number (72800173340).

Almost surely, 2^218400520017 is an apocalyptic number.

It is an amenable number.

218400520017 is a deficient number, since it is larger than the sum of its proper divisors (72800173343).

218400520017 is an equidigital number, since it uses as much as digits as its factorization.

218400520017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72800173342.

The product of its (nonzero) digits is 4480, while the sum is 30.

Adding to 218400520017 its reverse (710025004812), we get a palindrome (928425524829).

It can be divided in two parts, 2184005 and 20017, that added together give a palindrome (2204022).

The spelling of 218400520017 in words is "two hundred eighteen billion, four hundred million, five hundred twenty thousand, seventeen".