665532125 has 8 divisors (see below), whose sum is σ = 830584248. Its totient is φ = 532425600.

The previous prime is 665532089. The next prime is 665532137. The reversal of 665532125 is 521235566.

It can be written as a sum of positive squares in 4 ways, for example, as 1387684 + 664144441 = 1178^2 + 25771^2 .

It is not a de Polignac number, because 665532125 - 2⁸ = 665531869 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 2662004 + ... + 2662253.

It is an arithmetic number, because the mean of its divisors is an integer number (103823031).

Almost surely, 2^665532125 is an apocalyptic number.

It is an amenable number.

665532125 is a deficient number, since it is larger than the sum of its proper divisors (165052123).

665532125 is an equidigital number, since it uses as much as digits as its factorization.

665532125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324272 (or 5324262 counting only the distinct ones).

The product of its digits is 54000, while the sum is 35.

The square root of 665532125 is about 25797.9093145162. The cubic root of 665532125 is about 873.0846266371.

The spelling of 665532125 in words is "six hundred sixty-five million, five hundred thirty-two thousand, one hundred twenty-five".