18506230213 has 4 divisors (see below), whose sum is σ = 18899979840. Its totient is φ = 18112480588.

The previous prime is 18506230189. The next prime is 18506230231. The reversal of 18506230213 is 31203260581.

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 an emirpimes, since its reverse is a distinct semiprime: 31203260581 = 32257 ⋅967333.

It is a cyclic number.

It is not a de Polignac number, because 18506230213 - 2⁵ = 18506230181 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 (18506230283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196874743 + ... + 196874836.

It is an arithmetic number, because the mean of its divisors is an integer number (4724994960).

Almost surely, 2^18506230213 is an apocalyptic number.

It is an amenable number.

18506230213 is a deficient number, since it is larger than the sum of its proper divisors (393749627).

18506230213 is an equidigital number, since it uses as much as digits as its factorization.

18506230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393749626.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 18506230213 its reverse (31203260581), we get a palindrome (49709490794).

The spelling of 18506230213 in words is "eighteen billion, five hundred six million, two hundred thirty thousand, two hundred thirteen".