18009337943 has 4 divisors (see below), whose sum is σ = 18009620208. Its totient is φ = 18009055680.

The previous prime is 18009337909. The next prime is 18009337961. The reversal of 18009337943 is 34973390081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34973390081 = 7 ⋅4996198583.

It is a cyclic number.

It is not a de Polignac number, because 18009337943 - 2²⁶ = 17942229079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009337903) 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, 5030 + ... + 189852.

It is an arithmetic number, because the mean of its divisors is an integer number (4502405052).

Almost surely, 2^18009337943 is an apocalyptic number.

18009337943 is a deficient number, since it is larger than the sum of its proper divisors (282265).

18009337943 is an equidigital number, since it uses as much as digits as its factorization.

18009337943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282264.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 18009337943 in words is "eighteen billion, nine million, three hundred thirty-seven thousand, nine hundred forty-three".