16818220138 has 8 divisors (see below), whose sum is σ = 25245788832. Its totient is φ = 8402957196.

The previous prime is 16818220117. The next prime is 16818220169. The reversal of 16818220138 is 83102281861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16818220138² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16818220138.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3073020 + ... + 3078487.

It is an arithmetic number, because the mean of its divisors is an integer number (3155723604).

Almost surely, 2^16818220138 is an apocalyptic number.

16818220138 is a deficient number, since it is larger than the sum of its proper divisors (8427568694).

16818220138 is a wasteful number, since it uses less digits than its factorization.

16818220138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152876.

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 16818220138 in words is "sixteen billion, eight hundred eighteen million, two hundred twenty thousand, one hundred thirty-eight".