218564858845 has 16 divisors (see below), whose sum is σ = 263033064000. Its totient is φ = 174348929664.

The previous prime is 218564858789. The next prime is 218564858867. The reversal of 218564858845 is 548858465812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 218564858845 - 2⁹ = 218564858333 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3356406 + ... + 3420904.

It is an arithmetic number, because the mean of its divisors is an integer number (16439566500).

Almost surely, 2^218564858845 is an apocalyptic number.

It is an amenable number.

218564858845 is a deficient number, since it is larger than the sum of its proper divisors (44468205155).

218564858845 is a wasteful number, since it uses less digits than its factorization.

218564858845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66444.

The product of its digits is 98304000, while the sum is 64.

The spelling of 218564858845 in words is "two hundred eighteen billion, five hundred sixty-four million, eight hundred fifty-eight thousand, eight hundred forty-five".