218068817 has 4 divisors (see below), whose sum is σ = 218898240. Its totient is φ = 217239396.

The previous prime is 218068813. The next prime is 218068883. The reversal of 218068817 is 718860812.

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 a cyclic number.

It is not a de Polignac number, because 218068817 - 2² = 218068813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218068813) 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, 414317 + ... + 414842.

It is an arithmetic number, because the mean of its divisors is an integer number (54724560).

Almost surely, 2^218068817 is an apocalyptic number.

It is an amenable number.

218068817 is a deficient number, since it is larger than the sum of its proper divisors (829423).

218068817 is an equidigital number, since it uses as much as digits as its factorization.

218068817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829422.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 218068817 is about 14767.1533140277. The cubic root of 218068817 is about 601.9094879427.

The spelling of 218068817 in words is "two hundred eighteen million, sixty-eight thousand, eight hundred seventeen".