18703909369 has 2 divisors, whose sum is σ = 18703909370. Its totient is φ = 18703909368.

The previous prime is 18703909313. The next prime is 18703909421. The reversal of 18703909369 is 96390930781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13915269369 + 4788640000 = 117963^2 + 69200^2 .

It is a cyclic number.

It is not a de Polignac number, because 18703909369 - 2¹⁵ = 18703876601 is a prime.

It is a super-2 number, since 2×18703909369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18703909669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351954684 + 9351954685.

It is an arithmetic number, because the mean of its divisors is an integer number (9351954685).

Almost surely, 2^18703909369 is an apocalyptic number.

It is an amenable number.

18703909369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18703909369 is an equidigital number, since it uses as much as digits as its factorization.

18703909369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 55.

The spelling of 18703909369 in words is "eighteen billion, seven hundred three million, nine hundred nine thousand, three hundred sixty-nine".