865668625 has 8 divisors (see below), whose sum is σ = 1080354600. Its totient is φ = 692534800.

The previous prime is 865668623. The next prime is 865668637. The reversal of 865668625 is 526866568.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46335249 + 819333376 = 6807^2 + 28624^2 .

It is not a de Polignac number, because 865668625 - 2¹ = 865668623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865668623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3462550 + ... + 3462799.

It is an arithmetic number, because the mean of its divisors is an integer number (135044325).

Almost surely, 2^865668625 is an apocalyptic number.

It is an amenable number.

865668625 is a deficient number, since it is larger than the sum of its proper divisors (214685975).

865668625 is an equidigital number, since it uses as much as digits as its factorization.

865668625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925364 (or 6925354 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 52.

The square root of 865668625 is about 29422.2471099677. The cubic root of 865668625 is about 953.0533797299.

The spelling of 865668625 in words is "eight hundred sixty-five million, six hundred sixty-eight thousand, six hundred twenty-five".