844385931649 has 16 divisors (see below), whose sum is σ = 926469132624. Its totient is φ = 764886528000.

The previous prime is 844385931647. The next prime is 844385931667. The reversal of 844385931649 is 946139583448.

It can be written as a sum of positive squares in 8 ways, for example, as 181190692225 + 663195239424 = 425665^2 + 814368^2 .

It is a cyclic number.

It is not a de Polignac number, because 844385931649 - 2¹ = 844385931647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844385931647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2697192 + ... + 2993929.

It is an arithmetic number, because the mean of its divisors is an integer number (57904320789).

Almost surely, 2^844385931649 is an apocalyptic number.

It is an amenable number.

844385931649 is a deficient number, since it is larger than the sum of its proper divisors (82083200975).

844385931649 is a wasteful number, since it uses less digits than its factorization.

844385931649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691348.

The product of its digits is 89579520, while the sum is 64.

The spelling of 844385931649 in words is "eight hundred forty-four billion, three hundred eighty-five million, nine hundred thirty-one thousand, six hundred forty-nine".