18520003003 has 4 divisors (see below), whose sum is σ = 18521700840. Its totient is φ = 18518305168.

The previous prime is 18520002989. The next prime is 18520003009. The reversal of 18520003003 is 30030002581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30030002581 = 2143 ⋅14013067.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520003003 is a prime.

It is a super-2 number, since 2×18520003003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18520003009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832450 + ... + 854407.

It is an arithmetic number, because the mean of its divisors is an integer number (4630425210).

Almost surely, 2^18520003003 is an apocalyptic number.

18520003003 is a deficient number, since it is larger than the sum of its proper divisors (1697837).

18520003003 is a wasteful number, since it uses less digits than its factorization.

18520003003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697836.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 18520003003 its reverse (30030002581), we get a palindrome (48550005584).

The spelling of 18520003003 in words is "eighteen billion, five hundred twenty million, three thousand, three".