18306743309 has 2 divisors, whose sum is σ = 18306743310. Its totient is φ = 18306743308.

The previous prime is 18306743293. The next prime is 18306743327. The reversal of 18306743309 is 90334760381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16597168900 + 1709574409 = 128830^2 + 41347^2 .

It is a cyclic number.

It is not a de Polignac number, because 18306743309 - 2⁴ = 18306743293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18306743309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18306743009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9153371654 + 9153371655.

It is an arithmetic number, because the mean of its divisors is an integer number (9153371655).

Almost surely, 2^18306743309 is an apocalyptic number.

It is an amenable number.

18306743309 is a deficient number, since it is larger than the sum of its proper divisors (1).

18306743309 is an equidigital number, since it uses as much as digits as its factorization.

18306743309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 18306743309 in words is "eighteen billion, three hundred six million, seven hundred forty-three thousand, three hundred nine".