18185818363 has 4 divisors (see below), whose sum is σ = 18186810640. Its totient is φ = 18184826088.

The previous prime is 18185818361. The next prime is 18185818373. The reversal of 18185818363 is 36381858181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18185818363 - 2¹ = 18185818361 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18185818363.

It is not an unprimeable number, because it can be changed into a prime (18185818361) 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, 468120 + ... + 505477.

It is an arithmetic number, because the mean of its divisors is an integer number (4546702660).

Almost surely, 2^18185818363 is an apocalyptic number.

18185818363 is a deficient number, since it is larger than the sum of its proper divisors (992277).

18185818363 is an equidigital number, since it uses as much as digits as its factorization.

18185818363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992276.

The product of its digits is 1105920, while the sum is 52.

The spelling of 18185818363 in words is "eighteen billion, one hundred eighty-five million, eight hundred eighteen thousand, three hundred sixty-three".