18860144189 has 4 divisors (see below), whose sum is σ = 18866436000. Its totient is φ = 18853852380.

The previous prime is 18860144183. The next prime is 18860144207. The reversal of 18860144189 is 98144106881.

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: 98144106881 = 27509 ⋅3567709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18860144189 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 (18860144183) 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, 3141407 + ... + 3147404.

It is an arithmetic number, because the mean of its divisors is an integer number (4716609000).

Almost surely, 2^18860144189 is an apocalyptic number.

It is an amenable number.

18860144189 is a deficient number, since it is larger than the sum of its proper divisors (6291811).

18860144189 is an equidigital number, since it uses as much as digits as its factorization.

18860144189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6291810.

The product of its (nonzero) digits is 442368, while the sum is 50.

The spelling of 18860144189 in words is "eighteen billion, eight hundred sixty million, one hundred forty-four thousand, one hundred eighty-nine".