16800977789 has 2 divisors, whose sum is σ = 16800977790. Its totient is φ = 16800977788.

The previous prime is 16800977773. The next prime is 16800977839. The reversal of 16800977789 is 98777900861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16394753764 + 406224025 = 128042^2 + 20155^2 .

It is an emirp because it is prime and its reverse (98777900861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16800977789 - 2⁴ = 16800977773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16800977749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8400488894 + 8400488895.

It is an arithmetic number, because the mean of its divisors is an integer number (8400488895).

Almost surely, 2^16800977789 is an apocalyptic number.

It is an amenable number.

16800977789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16800977789 is an equidigital number, since it uses as much as digits as its factorization.

16800977789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 62.

The spelling of 16800977789 in words is "sixteen billion, eight hundred million, nine hundred seventy-seven thousand, seven hundred eighty-nine".