844721282739709 has 2 divisors, whose sum is σ = 844721282739710. Its totient is φ = 844721282739708.

The previous prime is 844721282739683. The next prime is 844721282739731. The reversal of 844721282739709 is 907937282127448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544648708044100 + 300072574695609 = 23337710^2 + 17322603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844721282739709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844721282734709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422360641369854 + 422360641369855.

It is an arithmetic number, because the mean of its divisors is an integer number (422360641369855).

Almost surely, 2^{844721282739709} is an apocalyptic number.

It is an amenable number.

844721282739709 is a deficient number, since it is larger than the sum of its proper divisors (1).

844721282739709 is an equidigital number, since it uses as much as digits as its factorization.

844721282739709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 682795008, while the sum is 73.

The spelling of 844721282739709 in words is "eight hundred forty-four trillion, seven hundred twenty-one billion, two hundred eighty-two million, seven hundred thirty-nine thousand, seven hundred nine".