18500018093 has 4 divisors (see below), whose sum is σ = 19000018620. Its totient is φ = 18000017568.

The previous prime is 18500018081. The next prime is 18500018177. The reversal of 18500018093 is 39081000581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39081000581 = 7 ⋅5583000083.

It can be written as a sum of positive squares in 2 ways, for example, as 11526599044 + 6973419049 = 107362^2 + 83507^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500018093 - 2⁴ = 18500018077 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 (18500018293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250000208 + ... + 250000281.

It is an arithmetic number, because the mean of its divisors is an integer number (4750004655).

Almost surely, 2^18500018093 is an apocalyptic number.

It is an amenable number.

18500018093 is a deficient number, since it is larger than the sum of its proper divisors (500000527).

18500018093 is an equidigital number, since it uses as much as digits as its factorization.

18500018093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500000526.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 18500018093 in words is "eighteen billion, five hundred million, eighteen thousand, ninety-three".