665612825 has 24 divisors (see below), whose sum is σ = 846052992. Its totient is φ = 519225920.

The previous prime is 665612821. The next prime is 665612833. The reversal of 665612825 is 528216566.

665612825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665612825 - 2² = 665612821 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665612821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371582 + ... + 373368.

It is an arithmetic number, because the mean of its divisors is an integer number (35252208).

Almost surely, 2^665612825 is an apocalyptic number.

It is an amenable number.

665612825 is a deficient number, since it is larger than the sum of its proper divisors (180440167).

665612825 is a wasteful number, since it uses less digits than its factorization.

665612825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161 (or 2156 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The square root of 665612825 is about 25799.4733473379. The cubic root of 665612825 is about 873.1199142309.

The spelling of 665612825 in words is "six hundred sixty-five million, six hundred twelve thousand, eight hundred twenty-five".