18128518405201 has 4 divisors (see below), whose sum is σ = 18128528870400. Its totient is φ = 18128507940004.

The previous prime is 18128518405133. The next prime is 18128518405247. The reversal of 18128518405201 is 10250481582181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18128518405201 - 2³⁵ = 18094158666833 is a prime.

It is a super-2 number, since 2×18128518405201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18128518405271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946161 + ... + 6328078.

It is an arithmetic number, because the mean of its divisors is an integer number (4532132217600).

Almost surely, 2^{18128518405201} is an apocalyptic number.

It is an amenable number.

18128518405201 is a deficient number, since it is larger than the sum of its proper divisors (10465199).

18128518405201 is an equidigital number, since it uses as much as digits as its factorization.

18128518405201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465198.

The product of its (nonzero) digits is 204800, while the sum is 46.

Adding to 18128518405201 its reverse (10250481582181), we get a palindrome (28378999987382).

The spelling of 18128518405201 in words is "eighteen trillion, one hundred twenty-eight billion, five hundred eighteen million, four hundred five thousand, two hundred one".