665304125 has 16 divisors (see below), whose sum is σ = 843920688. Its totient is φ = 523512000.

The previous prime is 665304097. The next prime is 665304131. The reversal of 665304125 is 521403566.

It can be written as a sum of positive squares in 8 ways, for example, as 525922489 + 139381636 = 22933^2 + 11806^2 .

It is not a de Polignac number, because 665304125 - 2¹⁰ = 665303101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665304091 and 665304100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36002 + ... + 51251.

It is an arithmetic number, because the mean of its divisors is an integer number (52745043).

Almost surely, 2^665304125 is an apocalyptic number.

It is an amenable number.

665304125 is a deficient number, since it is larger than the sum of its proper divisors (178616563).

665304125 is an equidigital number, since it uses as much as digits as its factorization.

665304125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87329 (or 87319 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 665304125 is about 25793.4899732471. The cubic root of 665304125 is about 872.9849139292.

The spelling of 665304125 in words is "six hundred sixty-five million, three hundred four thousand, one hundred twenty-five".