18122389553 has 4 divisors (see below), whose sum is σ = 18187813620. Its totient is φ = 18056965488.

The previous prime is 18122389513. The next prime is 18122389559. The reversal of 18122389553 is 35598322181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35598322181 = 85667 ⋅415543.

It can be written as a sum of positive squares in 2 ways, for example, as 3206164129 + 14916225424 = 56623^2 + 122132^2 .

It is a cyclic number.

It is not a de Polignac number, because 18122389553 - 2⁶ = 18122389489 is a prime.

It is a super-2 number, since 2×18122389553² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18122389498 and 18122389507.

It is not an unprimeable number, because it can be changed into a prime (18122389559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32711618 + ... + 32712171.

It is an arithmetic number, because the mean of its divisors is an integer number (4546953405).

Almost surely, 2^18122389553 is an apocalyptic number.

It is an amenable number.

18122389553 is a deficient number, since it is larger than the sum of its proper divisors (65424067).

18122389553 is an equidigital number, since it uses as much as digits as its factorization.

18122389553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65424066.

The product of its digits is 518400, while the sum is 47.

The spelling of 18122389553 in words is "eighteen billion, one hundred twenty-two million, three hundred eighty-nine thousand, five hundred fifty-three".