842525378861 has 2 divisors, whose sum is σ = 842525378862. Its totient is φ = 842525378860.

The previous prime is 842525378777. The next prime is 842525378869. The reversal of 842525378861 is 168873525248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839853109225 + 2672269636 = 916435^2 + 51694^2 .

It is a cyclic number.

It is not a de Polignac number, because 842525378861 - 2¹⁸ = 842525116717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842525378861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842525378869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421262689430 + 421262689431.

It is an arithmetic number, because the mean of its divisors is an integer number (421262689431).

Almost surely, 2^842525378861 is an apocalyptic number.

It is an amenable number.

842525378861 is a deficient number, since it is larger than the sum of its proper divisors (1).

842525378861 is an equidigital number, since it uses as much as digits as its factorization.

842525378861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25804800, while the sum is 59.

The spelling of 842525378861 in words is "eight hundred forty-two billion, five hundred twenty-five million, three hundred seventy-eight thousand, eight hundred sixty-one".