856424228873 has 2 divisors, whose sum is σ = 856424228874. Its totient is φ = 856424228872.

The previous prime is 856424228861. The next prime is 856424228953. The reversal of 856424228873 is 378822424658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856379966464 + 44262409 = 925408^2 + 6653^2 .

It is a cyclic number.

It is not a de Polignac number, because 856424228873 - 2¹⁸ = 856423966729 is a prime.

It is not a weakly prime, because it can be changed into another prime (856424228843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428212114436 + 428212114437.

It is an arithmetic number, because the mean of its divisors is an integer number (428212114437).

Almost surely, 2^856424228873 is an apocalyptic number.

It is an amenable number.

856424228873 is a deficient number, since it is larger than the sum of its proper divisors (1).

856424228873 is an equidigital number, since it uses as much as digits as its factorization.

856424228873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41287680, while the sum is 59.

The spelling of 856424228873 in words is "eight hundred fifty-six billion, four hundred twenty-four million, two hundred twenty-eight thousand, eight hundred seventy-three".