81228282218 has 8 divisors (see below), whose sum is σ = 123048784260. Its totient is φ = 40212020800.

The previous prime is 81228282211. The next prime is 81228282227.

81228282218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 80589557689 + 638724529 = 283883^2 + 25273^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81228282211) 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, 201059903 + ... + 201060306.

Almost surely, 2^81228282218 is an apocalyptic number.

81228282218 is a deficient number, since it is larger than the sum of its proper divisors (41820502042).

81228282218 is a wasteful number, since it uses less digits than its factorization.

81228282218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402120312.

The product of its digits is 131072, while the sum is 44.

The spelling of 81228282218 in words is "eighty-one billion, two hundred twenty-eight million, two hundred eighty-two thousand, two hundred eighteen".