808663616218 has 4 divisors (see below), whose sum is σ = 1212995424330. Its totient is φ = 404331808108.

The previous prime is 808663616213. The next prime is 808663616239. The reversal of 808663616218 is 812616366808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 776966442849 + 31697173369 = 881457^2 + 178037^2 .

It is not an unprimeable number, because it can be changed into a prime (808663616213) 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 as a sum of consecutive naturals, namely, 202165904053 + ... + 202165904056.

Almost surely, 2^808663616218 is an apocalyptic number.

808663616218 is a deficient number, since it is larger than the sum of its proper divisors (404331808112).

808663616218 is a wasteful number, since it uses less digits than its factorization.

808663616218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404331808111.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 808663616218 in words is "eight hundred eight billion, six hundred sixty-three million, six hundred sixteen thousand, two hundred eighteen".