844393642061 has 2 divisors, whose sum is σ = 844393642062. Its totient is φ = 844393642060.

The previous prime is 844393642033. The next prime is 844393642133. The reversal of 844393642061 is 160246393448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711601909225 + 132791732836 = 843565^2 + 364406^2 .

It is a cyclic number.

It is not a de Polignac number, because 844393642061 - 2⁶ = 844393641997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844393642361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422196821030 + 422196821031.

It is an arithmetic number, because the mean of its divisors is an integer number (422196821031).

Almost surely, 2^844393642061 is an apocalyptic number.

It is an amenable number.

844393642061 is a deficient number, since it is larger than the sum of its proper divisors (1).

844393642061 is an equidigital number, since it uses as much as digits as its factorization.

844393642061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 50.

The spelling of 844393642061 in words is "eight hundred forty-four billion, three hundred ninety-three million, six hundred forty-two thousand, sixty-one".