16818008861 has 2 divisors, whose sum is σ = 16818008862. Its totient is φ = 16818008860.

The previous prime is 16818008849. The next prime is 16818008869. The reversal of 16818008861 is 16880081861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16809122500 + 8886361 = 129650^2 + 2981^2 .

It is an emirp because it is prime and its reverse (16880081861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16818008861 - 2⁶ = 16818008797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16818008869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8409004430 + 8409004431.

It is an arithmetic number, because the mean of its divisors is an integer number (8409004431).

Almost surely, 2^16818008861 is an apocalyptic number.

It is an amenable number.

16818008861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16818008861 is an equidigital number, since it uses as much as digits as its factorization.

16818008861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147456, while the sum is 47.

The spelling of 16818008861 in words is "sixteen billion, eight hundred eighteen million, eight thousand, eight hundred sixty-one".