12345566677889 has 4 divisors (see below), whose sum is σ = 12347579657556. Its totient is φ = 12343553698224.

The previous prime is 12345566677757. The next prime is 12345566677943. The reversal of 12345566677889 is 98877666554321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12067057170289 + 278509507600 = 3473767^2 + 527740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12345566677889 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 (12345566677289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006480634 + ... + 1006492899.

It is an arithmetic number, because the mean of its divisors is an integer number (3086894914389).

Almost surely, 2^{12345566677889} is an apocalyptic number.

It is an amenable number.

12345566677889 is a deficient number, since it is larger than the sum of its proper divisors (2012979667).

12345566677889 is an equidigital number, since it uses as much as digits as its factorization.

12345566677889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012979666.

The product of its digits is 3657830400, while the sum is 77.

The spelling of 12345566677889 in words is "twelve trillion, three hundred forty-five billion, five hundred sixty-six million, six hundred seventy-seven thousand, eight hundred eighty-nine".