844142519917 has 2 divisors, whose sum is σ = 844142519918. Its totient is φ = 844142519916.

The previous prime is 844142519911. The next prime is 844142519959. The reversal of 844142519917 is 719915241448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807974467876 + 36168052041 = 898874^2 + 190179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844142519917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844142519911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422071259958 + 422071259959.

It is an arithmetic number, because the mean of its divisors is an integer number (422071259959).

Almost surely, 2^844142519917 is an apocalyptic number.

It is an amenable number.

844142519917 is a deficient number, since it is larger than the sum of its proper divisors (1).

844142519917 is an equidigital number, since it uses as much as digits as its factorization.

844142519917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The spelling of 844142519917 in words is "eight hundred forty-four billion, one hundred forty-two million, five hundred nineteen thousand, nine hundred seventeen".