12345567889 has 24 divisors (see below), whose sum is σ = 13453826280. Its totient is φ = 11318372352.

The previous prime is 12345567881. The next prime is 12345567901. The reversal of 12345567889 is 98876554321.

It can be written as a sum of positive squares in 4 ways, for example, as 616677889 + 11728890000 = 24833^2 + 108300^2 .

It is not a de Polignac number, because 12345567889 - 2³ = 12345567881 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12345567881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2575507 + ... + 2580295.

It is an arithmetic number, because the mean of its divisors is an integer number (560576095).

Almost surely, 2^12345567889 is an apocalyptic number.

12345567889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12345567889 is a deficient number, since it is larger than the sum of its proper divisors (1108258391).

12345567889 is a wasteful number, since it uses less digits than its factorization.

12345567889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057 (or 5038 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 58.

The spelling of 12345567889 in words is "twelve billion, three hundred forty-five million, five hundred sixty-seven thousand, eight hundred eighty-nine".