12444445691 has 4 divisors (see below), whose sum is σ = 12601970400. Its totient is φ = 12286920984.

The previous prime is 12444445681. The next prime is 12444445729. The reversal of 12444445691 is 19654444421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19654444421 = 277 ⋅70954673.

It is a cyclic number.

It is not a de Polignac number, because 12444445691 - 2⁶ = 12444445627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12444445631) 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, 78762236 + ... + 78762393.

It is an arithmetic number, because the mean of its divisors is an integer number (3150492600).

Almost surely, 2^12444445691 is an apocalyptic number.

12444445691 is a deficient number, since it is larger than the sum of its proper divisors (157524709).

12444445691 is an equidigital number, since it uses as much as digits as its factorization.

12444445691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157524708.

The product of its digits is 552960, while the sum is 44.

The spelling of 12444445691 in words is "twelve billion, four hundred forty-four million, four hundred forty-five thousand, six hundred ninety-one".