18668203403 has 4 divisors (see below), whose sum is σ = 18669415608. Its totient is φ = 18666991200.

The previous prime is 18668203357. The next prime is 18668203427. The reversal of 18668203403 is 30430286681.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18668203403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18661203403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582701 + ... + 613902.

It is an arithmetic number, because the mean of its divisors is an integer number (4667353902).

Almost surely, 2^18668203403 is an apocalyptic number.

18668203403 is a deficient number, since it is larger than the sum of its proper divisors (1212205).

18668203403 is a wasteful number, since it uses less digits than its factorization.

18668203403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212204.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 18668203403 in words is "eighteen billion, six hundred sixty-eight million, two hundred three thousand, four hundred three".