18003220533 has 6 divisors (see below), whose sum is σ = 26004651894. Its totient is φ = 12002147016.

The previous prime is 18003220517. The next prime is 18003220589. The reversal of 18003220533 is 33502230081.

18003220533 is a `hidden beast` number, since 1 + 80 + 0 + 32 + 20 + 533 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17811037764 + 192182769 = 133458^2 + 13863^2 .

It is not a de Polignac number, because 18003220533 - 2⁴ = 18003220517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18003220497 and 18003220506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18003220513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000178910 + ... + 1000178927.

It is an arithmetic number, because the mean of its divisors is an integer number (4334108649).

Almost surely, 2^18003220533 is an apocalyptic number.

It is an amenable number.

18003220533 is a deficient number, since it is larger than the sum of its proper divisors (8001431361).

18003220533 is a wasteful number, since it uses less digits than its factorization.

18003220533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000357843 (or 2000357840 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 18003220533 in words is "eighteen billion, three million, two hundred twenty thousand, five hundred thirty-three".