840019805473 has 2 divisors, whose sum is σ = 840019805474. Its totient is φ = 840019805472.

The previous prime is 840019805413. The next prime is 840019805489. The reversal of 840019805473 is 374508910048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836377924369 + 3641881104 = 914537^2 + 60348^2 .

It is a cyclic number.

It is not a de Polignac number, because 840019805473 - 2³³ = 831429870881 is a prime.

It is not a weakly prime, because it can be changed into another prime (840019805413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420009902736 + 420009902737.

It is an arithmetic number, because the mean of its divisors is an integer number (420009902737).

Almost surely, 2^840019805473 is an apocalyptic number.

It is an amenable number.

840019805473 is a deficient number, since it is larger than the sum of its proper divisors (1).

840019805473 is an equidigital number, since it uses as much as digits as its factorization.

840019805473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 840019805473 in words is "eight hundred forty billion, nineteen million, eight hundred five thousand, four hundred seventy-three".