18873753809 has 2 divisors, whose sum is σ = 18873753810. Its totient is φ = 18873753808.

The previous prime is 18873753781. The next prime is 18873753817. The reversal of 18873753809 is 90835737881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18430777600 + 442976209 = 135760^2 + 21047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18873753809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18873756809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436876904 + 9436876905.

It is an arithmetic number, because the mean of its divisors is an integer number (9436876905).

Almost surely, 2^18873753809 is an apocalyptic number.

It is an amenable number.

18873753809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18873753809 is an equidigital number, since it uses as much as digits as its factorization.

18873753809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 18873753809 in words is "eighteen billion, eight hundred seventy-three million, seven hundred fifty-three thousand, eight hundred nine".