89181681818 has 4 divisors (see below), whose sum is σ = 133772522730. Its totient is φ = 44590840908.

The previous prime is 89181681817. The next prime is 89181681833. The reversal of 89181681818 is 81818618198.

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., 47499151249 + 41682530569 = 217943^2 + 204163^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89181681817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22295420453 + ... + 22295420456.

Almost surely, 2^89181681818 is an apocalyptic number.

89181681818 is a deficient number, since it is larger than the sum of its proper divisors (44590840912).

89181681818 is a wasteful number, since it uses less digits than its factorization.

89181681818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44590840911.

The product of its digits is 1769472, while the sum is 59.

The spelling of 89181681818 in words is "eighty-nine billion, one hundred eighty-one million, six hundred eighty-one thousand, eight hundred eighteen".