825665039 has 2 divisors, whose sum is σ = 825665040. Its totient is φ = 825665038.

The previous prime is 825665033. The next prime is 825665047. The reversal of 825665039 is 930566528.

It is a happy number.

825665039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 825665039 - 2⁴ = 825665023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825665033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412832519 + 412832520.

It is an arithmetic number, because the mean of its divisors is an integer number (412832520).

Almost surely, 2^825665039 is an apocalyptic number.

825665039 is a deficient number, since it is larger than the sum of its proper divisors (1).

825665039 is an equidigital number, since it uses as much as digits as its factorization.

825665039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 825665039 is about 28734.3877436078. The cubic root of 825665039 is about 938.1406731614.

The spelling of 825665039 in words is "eight hundred twenty-five million, six hundred sixty-five thousand, thirty-nine".