12345778889 has 4 divisors (see below), whose sum is σ = 12350383056. Its totient is φ = 12341174724.

The previous prime is 12345778883. The next prime is 12345778961. The reversal of 12345778889 is 98887754321.

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: 98887754321 = 3767 ⋅26251063.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12345778889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12345778883) 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, 2298059 + ... + 2303424.

It is an arithmetic number, because the mean of its divisors is an integer number (3087595764).

Almost surely, 2^12345778889 is an apocalyptic number.

It is an amenable number.

12345778889 is a deficient number, since it is larger than the sum of its proper divisors (4604167).

12345778889 is an equidigital number, since it uses as much as digits as its factorization.

12345778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604166.

The product of its digits is 27095040, while the sum is 62.

The spelling of 12345778889 in words is "twelve billion, three hundred forty-five million, seven hundred seventy-eight thousand, eight hundred eighty-nine".