18181820003 has 8 divisors (see below), whose sum is σ = 18504800736. Its totient is φ = 17859643200.

The previous prime is 18181819939. The next prime is 18181820023. The reversal of 18181820003 is 30002818181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18181820003 - 2⁶ = 18181819939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18181820023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155258 + ... + 245903.

It is an arithmetic number, because the mean of its divisors is an integer number (2313100092).

Almost surely, 2^18181820003 is an apocalyptic number.

18181820003 is a deficient number, since it is larger than the sum of its proper divisors (322980733).

18181820003 is an equidigital number, since it uses as much as digits as its factorization.

18181820003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401965.

The product of its (nonzero) digits is 3072, while the sum is 32.

The spelling of 18181820003 in words is "eighteen billion, one hundred eighty-one million, eight hundred twenty thousand, three".