812111121111218 has 16 divisors (see below), whose sum is σ = 1230423979708440. Its totient is φ = 401971077168000.

The previous prime is 812111121111167. The next prime is 812111121111233.

812111121111218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 757991366279449 + 54119754831769 = 27531643^2 + 7356613^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319387043 + ... + 321919718.

Almost surely, 2^{812111121111218} is an apocalyptic number.

812111121111218 is a deficient number, since it is larger than the sum of its proper divisors (418312858597222).

812111121111218 is a wasteful number, since it uses less digits than its factorization.

812111121111218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641313133.

The product of its digits is 512, while the sum is 32.

The spelling of 812111121111218 in words is "eight hundred twelve trillion, one hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eighteen".