805816187873 has 2 divisors, whose sum is σ = 805816187874. Its totient is φ = 805816187872.

The previous prime is 805816187773. The next prime is 805816187903. The reversal of 805816187873 is 378781618508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421159465024 + 384656722849 = 648968^2 + 620207^2 .

It is a cyclic number.

It is not a de Polignac number, because 805816187873 - 2¹⁶ = 805816122337 is a prime.

It is not a weakly prime, because it can be changed into another prime (805816187573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402908093936 + 402908093937.

It is an arithmetic number, because the mean of its divisors is an integer number (402908093937).

Almost surely, 2^805816187873 is an apocalyptic number.

It is an amenable number.

805816187873 is a deficient number, since it is larger than the sum of its proper divisors (1).

805816187873 is an equidigital number, since it uses as much as digits as its factorization.

805816187873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 62.

The spelling of 805816187873 in words is "eight hundred five billion, eight hundred sixteen million, one hundred eighty-seven thousand, eight hundred seventy-three".