18363558401 has 4 divisors (see below), whose sum is σ = 18664600404. Its totient is φ = 18062516400.

The previous prime is 18363558397. The next prime is 18363558407. The reversal of 18363558401 is 10485536381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3049248400 + 15314310001 = 55220^2 + 123751^2 .

It is a cyclic number.

It is not a de Polignac number, because 18363558401 - 2² = 18363558397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18363558407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150520910 + ... + 150521031.

It is an arithmetic number, because the mean of its divisors is an integer number (4666150101).

Almost surely, 2^18363558401 is an apocalyptic number.

It is an amenable number.

18363558401 is a deficient number, since it is larger than the sum of its proper divisors (301042003).

18363558401 is an equidigital number, since it uses as much as digits as its factorization.

18363558401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301042002.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 18363558401 in words is "eighteen billion, three hundred sixty-three million, five hundred fifty-eight thousand, four hundred one".