18526204321 has 3 divisors (see below), whose sum is σ = 18526340433. Its totient is φ = 18526068210.

The previous prime is 18526204313. The next prime is 18526204327. The reversal of 18526204321 is 12340262581.

The square root of 18526204321 is 136111.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12340262581 = 2473 ⋅4989997.

It is not a de Polignac number, because 18526204321 - 2³ = 18526204313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18526204327) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 68056 + ... + 204166.

It is an arithmetic number, because the mean of its divisors is an integer number (6175446811).

Almost surely, 2^18526204321 is an apocalyptic number.

18526204321 is the 136111-st square number.

18526204321 is the 68056-th centered octagonal number.

It is an amenable number.

18526204321 is a deficient number, since it is larger than the sum of its proper divisors (136112).

18526204321 is an frugal number, since it uses more digits than its factorization.

18526204321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272222 (or 136111 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 18526204321 in words is "eighteen billion, five hundred twenty-six million, two hundred four thousand, three hundred twenty-one".