218655685209 has 8 divisors (see below), whose sum is σ = 313967137792. Its totient is φ = 134557344720.

The previous prime is 218655685201. The next prime is 218655685277. The reversal of 218655685209 is 902586556812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218655685209 - 2³ = 218655685201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218655685201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2803277977 + ... + 2803278054.

It is an arithmetic number, because the mean of its divisors is an integer number (39245892224).

Almost surely, 2^218655685209 is an apocalyptic number.

It is an amenable number.

218655685209 is a deficient number, since it is larger than the sum of its proper divisors (95311452583).

218655685209 is a wasteful number, since it uses less digits than its factorization.

218655685209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606556047.

The product of its (nonzero) digits is 10368000, while the sum is 57.

The spelling of 218655685209 in words is "two hundred eighteen billion, six hundred fifty-five million, six hundred eighty-five thousand, two hundred nine".