12445667789 has 4 divisors (see below), whose sum is σ = 12555806556. Its totient is φ = 12335529024.

The previous prime is 12445667783. The next prime is 12445667797. The reversal of 12445667789 is 98776654421.

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 365459689 + 12080208100 = 19117^2 + 109910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12445667789 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12445667783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55069214 + ... + 55069439.

It is an arithmetic number, because the mean of its divisors is an integer number (3138951639).

Almost surely, 2^12445667789 is an apocalyptic number.

It is an amenable number.

12445667789 is a deficient number, since it is larger than the sum of its proper divisors (110138767).

12445667789 is a wasteful number, since it uses less digits than its factorization.

12445667789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110138766.

The product of its digits is 20321280, while the sum is 59.

The spelling of 12445667789 in words is "twelve billion, four hundred forty-five million, six hundred sixty-seven thousand, seven hundred eighty-nine".