844393642091 has 16 divisors (see below), whose sum is σ = 854327053440. Its totient is φ = 834505499520.

The previous prime is 844393642061. The next prime is 844393642133. The reversal of 844393642091 is 190246393448.

It is a cyclic number.

It is not a de Polignac number, because 844393642091 - 2³⁴ = 827213772907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844393642061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142558856 + ... + 142564778.

It is an arithmetic number, because the mean of its divisors is an integer number (53395440840).

Almost surely, 2^844393642091 is an apocalyptic number.

844393642091 is a deficient number, since it is larger than the sum of its proper divisors (9933411349).

844393642091 is a wasteful number, since it uses less digits than its factorization.

844393642091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466.

The product of its (nonzero) digits is 4478976, while the sum is 53.

The spelling of 844393642091 in words is "eight hundred forty-four billion, three hundred ninety-three million, six hundred forty-two thousand, ninety-one".