844564767465449 has 64 divisors (see below), whose sum is σ = 877118279304960. Its totient is φ = 812692016640000.

The previous prime is 844564767465439. The next prime is 844564767465457. The reversal of 844564767465449 is 944564767465448.

It is a cyclic number.

It is not a de Polignac number, because 844564767465449 - 2¹² = 844564767461353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844564767465439) 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 63 ways as a sum of consecutive naturals, for example, 726194984342 + ... + 726194985504.

It is an arithmetic number, because the mean of its divisors is an integer number (13704973114140).

Almost surely, 2^{844564767465449} is an apocalyptic number.

It is an amenable number.

844564767465449 is a deficient number, since it is larger than the sum of its proper divisors (32553511839511).

844564767465449 is a wasteful number, since it uses less digits than its factorization.

844564767465449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922.

The product of its digits is 78033715200, while the sum is 83.

Subtracting 844564767465449 from its reverse (944564767465448), we obtain a palindrome (99999999999999).

The spelling of 844564767465449 in words is "eight hundred forty-four trillion, five hundred sixty-four billion, seven hundred sixty-seven million, four hundred sixty-five thousand, four hundred forty-nine".