18005718469 has 4 divisors (see below), whose sum is σ = 18012228544. Its totient is φ = 17999208396.

The previous prime is 18005718463. The next prime is 18005718491. The reversal of 18005718469 is 96481750081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96481750081 = 106907 ⋅902483.

It is a cyclic number.

It is not a de Polignac number, because 18005718469 - 2³³ = 9415783877 is a prime.

It is a super-2 number, since 2×18005718469² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005718463) 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, 3250887 + ... + 3256420.

It is an arithmetic number, because the mean of its divisors is an integer number (4503057136).

Almost surely, 2^18005718469 is an apocalyptic number.

It is an amenable number.

18005718469 is a deficient number, since it is larger than the sum of its proper divisors (6510075).

18005718469 is an equidigital number, since it uses as much as digits as its factorization.

18005718469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510074.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 18005718469 in words is "eighteen billion, five million, seven hundred eighteen thousand, four hundred sixty-nine".