12445566779 has 4 divisors (see below), whose sum is σ = 12448064376. Its totient is φ = 12443069184.

The previous prime is 12445566673. The next prime is 12445566799. The reversal of 12445566779 is 97766554421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12445566779 - 2²⁴ = 12428789563 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 (12445566799) 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, 1241309 + ... + 1251294.

It is an arithmetic number, because the mean of its divisors is an integer number (3112016094).

Almost surely, 2^12445566779 is an apocalyptic number.

12445566779 is a deficient number, since it is larger than the sum of its proper divisors (2497597).

12445566779 is an equidigital number, since it uses as much as digits as its factorization.

12445566779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497596.

The product of its digits is 12700800, while the sum is 56.

The spelling of 12445566779 in words is "twelve billion, four hundred forty-five million, five hundred sixty-six thousand, seven hundred seventy-nine".