18465342409 has 4 divisors (see below), whose sum is σ = 18465648916. Its totient is φ = 18465035904.

The previous prime is 18465342397. The next prime is 18465342439. The reversal of 18465342409 is 90424356481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14265913600 + 4199428809 = 119440^2 + 64803^2 .

It is a cyclic number.

It is not a de Polignac number, because 18465342409 - 2¹⁵ = 18465309641 is a prime.

It is a super-2 number, since 2×18465342409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18465342439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29664 + ... + 194449.

It is an arithmetic number, because the mean of its divisors is an integer number (4616412229).

Almost surely, 2^18465342409 is an apocalyptic number.

It is an amenable number.

18465342409 is a deficient number, since it is larger than the sum of its proper divisors (306507).

18465342409 is an equidigital number, since it uses as much as digits as its factorization.

18465342409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306506.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 18465342409 in words is "eighteen billion, four hundred sixty-five million, three hundred forty-two thousand, four hundred nine".