16818138833 has 4 divisors (see below), whose sum is σ = 16818979380. Its totient is φ = 16817298288.

The previous prime is 16818138829. The next prime is 16818138839. The reversal of 16818138833 is 33883181861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33883181861 = 47 ⋅720918763.

It can be written as a sum of positive squares in 2 ways, for example, as 2880683584 + 13937455249 = 53672^2 + 118057^2 .

It is a cyclic number.

It is not a de Polignac number, because 16818138833 - 2² = 16818138829 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16818138839) 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 3 ways as a sum of consecutive naturals, for example, 389510 + ... + 430527.

It is an arithmetic number, because the mean of its divisors is an integer number (4204744845).

Almost surely, 2^16818138833 is an apocalyptic number.

It is an amenable number.

16818138833 is a deficient number, since it is larger than the sum of its proper divisors (840547).

16818138833 is an equidigital number, since it uses as much as digits as its factorization.

16818138833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840546.

The product of its digits is 663552, while the sum is 50.

The spelling of 16818138833 in words is "sixteen billion, eight hundred eighteen million, one hundred thirty-eight thousand, eight hundred thirty-three".