812489984218 has 24 divisors (see below), whose sum is σ = 1361561956020. Its totient is φ = 363259300800.

The previous prime is 812489984213. The next prime is 812489984221.

812489984218 is nontrivially palindromic in base 10.

812489984218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 780471534249 + 32018449969 = 883443^2 + 178937^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 812489984218.

It is not an unprimeable number, because it can be changed into a prime (812489984213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27504883 + ... + 27534406.

Almost surely, 2^812489984218 is an apocalyptic number.

812489984218 is a deficient number, since it is larger than the sum of its proper divisors (549071971802).

812489984218 is a wasteful number, since it uses less digits than its factorization.

812489984218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55039374 (or 55039363 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 64.

The spelling of 812489984218 in words is "eight hundred twelve billion, four hundred eighty-nine million, nine hundred eighty-four thousand, two hundred eighteen".