218133476212805 has 4 divisors (see below), whose sum is σ = 261760171455372. Its totient is φ = 174506780970240.

The previous prime is 218133476212763. The next prime is 218133476212829. The reversal of 218133476212805 is 508212674331812.

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 85481729570689 + 132651746642116 = 9245633^2 + 11517454^2 .

It is not a de Polignac number, because 218133476212805 - 2¹⁴ = 218133476196421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21813347621276 + ... + 21813347621285.

It is an arithmetic number, because the mean of its divisors is an integer number (65440042863843).

Almost surely, 2^{218133476212805} is an apocalyptic number.

It is an amenable number.

218133476212805 is a deficient number, since it is larger than the sum of its proper divisors (43626695242567).

218133476212805 is an equidigital number, since it uses as much as digits as its factorization.

218133476212805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43626695242566.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 218133476212805 in words is "two hundred eighteen trillion, one hundred thirty-three billion, four hundred seventy-six million, two hundred twelve thousand, eight hundred five".