1803925823209 has 2 divisors, whose sum is σ = 1803925823210. Its totient is φ = 1803925823208.

The previous prime is 1803925823173. The next prime is 1803925823299. The reversal of 1803925823209 is 9023285293081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380749552809 + 423176270400 = 1175053^2 + 650520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1803925823209 - 2¹¹ = 1803925821161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1803925823299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 901962911604 + 901962911605.

It is an arithmetic number, because the mean of its divisors is an integer number (901962911605).

Almost surely, 2^{1803925823209} is an apocalyptic number.

It is an amenable number.

1803925823209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1803925823209 is an equidigital number, since it uses as much as digits as its factorization.

1803925823209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 1803925823209 in words is "one trillion, eight hundred three billion, nine hundred twenty-five million, eight hundred twenty-three thousand, two hundred nine".