840464999917 has 2 divisors, whose sum is σ = 840464999918. Its totient is φ = 840464999916.

The previous prime is 840464999837. The next prime is 840464999947. The reversal of 840464999917 is 719999464048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809659835721 + 30805164196 = 899811^2 + 175514^2 .

It is a cyclic number.

It is not a de Polignac number, because 840464999917 - 2⁷ = 840464999789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840464999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420232499958 + 420232499959.

It is an arithmetic number, because the mean of its divisors is an integer number (420232499959).

Almost surely, 2^840464999917 is an apocalyptic number.

It is an amenable number.

840464999917 is a deficient number, since it is larger than the sum of its proper divisors (1).

840464999917 is an equidigital number, since it uses as much as digits as its factorization.

840464999917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141087744, while the sum is 70.

The spelling of 840464999917 in words is "eight hundred forty billion, four hundred sixty-four million, nine hundred ninety-nine thousand, nine hundred seventeen".