81814241818 has 4 divisors (see below), whose sum is σ = 122721362730. Its totient is φ = 40907120908.

The previous prime is 81814241801. The next prime is 81814241867.

81814241818 is nontrivially palindromic in base 10.

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., 46827661609 + 34986580209 = 216397^2 + 187047^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20453560453 + ... + 20453560456.

Almost surely, 2^81814241818 is an apocalyptic number.

81814241818 is a deficient number, since it is larger than the sum of its proper divisors (40907120912).

81814241818 is a wasteful number, since it uses less digits than its factorization.

81814241818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40907120911.

The product of its digits is 131072, while the sum is 46.

The spelling of 81814241818 in words is "eighty-one billion, eight hundred fourteen million, two hundred forty-one thousand, eight hundred eighteen".