18434189889 has 6 divisors (see below), whose sum is σ = 26627163186. Its totient is φ = 12289459920.

The previous prime is 18434189843. The next prime is 18434189927. The reversal of 18434189889 is 98898143481.

18434189889 is a `hidden beast` number, since 18 + 43 + 418 + 98 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18175623489 + 258566400 = 134817^2 + 16080^2 .

It is not a de Polignac number, because 18434189889 - 2¹⁵ = 18434157121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18434189689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1024121652 + ... + 1024121669.

It is an arithmetic number, because the mean of its divisors is an integer number (4437860531).

Almost surely, 2^18434189889 is an apocalyptic number.

It is an amenable number.

18434189889 is a deficient number, since it is larger than the sum of its proper divisors (8192973297).

18434189889 is a wasteful number, since it uses less digits than its factorization.

18434189889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048243327 (or 2048243324 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 63.

The spelling of 18434189889 in words is "eighteen billion, four hundred thirty-four million, one hundred eighty-nine thousand, eight hundred eighty-nine".