18189893893 has 4 divisors (see below), whose sum is σ = 18576912960. Its totient is φ = 17802874828.

The previous prime is 18189893881. The next prime is 18189893921. The reversal of 18189893893 is 39839898181.

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 18189893893 - 2¹⁷ = 18189762821 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 (18189893093) 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, 193509463 + ... + 193509556.

It is an arithmetic number, because the mean of its divisors is an integer number (4644228240).

Almost surely, 2^18189893893 is an apocalyptic number.

It is an amenable number.

18189893893 is a deficient number, since it is larger than the sum of its proper divisors (387019067).

18189893893 is an equidigital number, since it uses as much as digits as its factorization.

18189893893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387019066.

The product of its digits is 26873856, while the sum is 67.

The spelling of 18189893893 in words is "eighteen billion, one hundred eighty-nine million, eight hundred ninety-three thousand, eight hundred ninety-three".