18063235621 has 4 divisors (see below), whose sum is σ = 18483310912. Its totient is φ = 17643160332.

The previous prime is 18063235601. The next prime is 18063235639. The reversal of 18063235621 is 12653236081.

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.

It is a cyclic number.

It is not a de Polignac number, because 18063235621 - 2⁹ = 18063235109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18063235601) 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, 210037581 + ... + 210037666.

It is an arithmetic number, because the mean of its divisors is an integer number (4620827728).

Almost surely, 2^18063235621 is an apocalyptic number.

It is an amenable number.

18063235621 is a deficient number, since it is larger than the sum of its proper divisors (420075291).

18063235621 is an equidigital number, since it uses as much as digits as its factorization.

18063235621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420075290.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 18063235621 in words is "eighteen billion, sixty-three million, two hundred thirty-five thousand, six hundred twenty-one".