18164733409 has 2 divisors, whose sum is σ = 18164733410. Its totient is φ = 18164733408.

The previous prime is 18164733401. The next prime is 18164733443. The reversal of 18164733409 is 90433746181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11019750625 + 7144982784 = 104975^2 + 84528^2 .

It is a cyclic number.

It is not a de Polignac number, because 18164733409 - 2³ = 18164733401 is a prime.

It is a super-2 number, since 2×18164733409² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18164733401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082366704 + 9082366705.

It is an arithmetic number, because the mean of its divisors is an integer number (9082366705).

Almost surely, 2^18164733409 is an apocalyptic number.

It is an amenable number.

18164733409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18164733409 is an equidigital number, since it uses as much as digits as its factorization.

18164733409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 18164733409 in words is "eighteen billion, one hundred sixty-four million, seven hundred thirty-three thousand, four hundred nine".