18818216319 has 24 divisors (see below), whose sum is σ = 30193907760. Its totient is φ = 10382461824.

The previous prime is 18818216309. The next prime is 18818216357. The reversal of 18818216319 is 91361281881.

It is a happy number.

It is not a de Polignac number, because 18818216319 - 2⁷ = 18818216191 is a prime.

It is a super-2 number, since 2×18818216319² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818216309) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2202894 + ... + 2211419.

It is an arithmetic number, because the mean of its divisors is an integer number (1258079490).

Almost surely, 2^18818216319 is an apocalyptic number.

18818216319 is a deficient number, since it is larger than the sum of its proper divisors (11375691441).

18818216319 is a wasteful number, since it uses less digits than its factorization.

18818216319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414359 (or 4414352 counting only the distinct ones).

The product of its digits is 165888, while the sum is 48.

The spelling of 18818216319 in words is "eighteen billion, eight hundred eighteen million, two hundred sixteen thousand, three hundred nineteen".