18040850818 has 4 divisors (see below), whose sum is σ = 27061276230. Its totient is φ = 9020425408.

The previous prime is 18040850801. The next prime is 18040850827. The reversal of 18040850818 is 81805804081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81805804081 = 47 ⋅1740549023.

It can be written as a sum of positive squares in only one way, i.e., 17967525849 + 73324969 = 134043^2 + 8563^2 .

It is a super-5 number, since 5×18040850818⁵ (a number of 52 digits) contains 55555 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510212703 + ... + 4510212706.

Almost surely, 2^18040850818 is an apocalyptic number.

18040850818 is a deficient number, since it is larger than the sum of its proper divisors (9020425412).

18040850818 is an equidigital number, since it uses as much as digits as its factorization.

18040850818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020425411.

The product of its (nonzero) digits is 81920, while the sum is 43.

The spelling of 18040850818 in words is "eighteen billion, forty million, eight hundred fifty thousand, eight hundred eighteen".