81230403218 has 16 divisors (see below), whose sum is σ = 123244162200. Its totient is φ = 40150272000.

The previous prime is 81230403169. The next prime is 81230403253.

81230403218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 65539584049 + 15690819169 = 256007^2 + 125263^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 184193 + ... + 443156.

Almost surely, 2^81230403218 is an apocalyptic number.

81230403218 is a deficient number, since it is larger than the sum of its proper divisors (42013758982).

81230403218 is a wasteful number, since it uses less digits than its factorization.

81230403218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628093.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 81230403218 in words is "eighty-one billion, two hundred thirty million, four hundred three thousand, two hundred eighteen".