825239500861 has 2 divisors, whose sum is σ = 825239500862. Its totient is φ = 825239500860.

The previous prime is 825239500777. The next prime is 825239500903. The reversal of 825239500861 is 168005932528.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820961032761 + 4278468100 = 906069^2 + 65410^2 .

It is a cyclic number.

It is not a de Polignac number, because 825239500861 - 2⁷ = 825239500733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825239500061) 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, 412619750430 + 412619750431.

It is an arithmetic number, because the mean of its divisors is an integer number (412619750431).

Almost surely, 2^825239500861 is an apocalyptic number.

It is an amenable number.

825239500861 is a deficient number, since it is larger than the sum of its proper divisors (1).

825239500861 is an equidigital number, since it uses as much as digits as its factorization.

825239500861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 825239500861 in words is "eight hundred twenty-five billion, two hundred thirty-nine million, five hundred thousand, eight hundred sixty-one".