18218217895 has 16 divisors (see below), whose sum is σ = 22094130240. Its totient is φ = 14419936000.

The previous prime is 18218217893. The next prime is 18218217911. The reversal of 18218217895 is 59871281281.

It is not a de Polignac number, because 18218217895 - 2¹ = 18218217893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218217893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 735726 + ... + 760084.

It is an arithmetic number, because the mean of its divisors is an integer number (1380883140).

Almost surely, 2^18218217895 is an apocalyptic number.

18218217895 is a deficient number, since it is larger than the sum of its proper divisors (3875912345).

18218217895 is a wasteful number, since it uses less digits than its factorization.

18218217895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25946.

The product of its digits is 645120, while the sum is 52.

The spelling of 18218217895 in words is "eighteen billion, two hundred eighteen million, two hundred seventeen thousand, eight hundred ninety-five".