665605325 has 24 divisors (see below), whose sum is σ = 1029011520. Its totient is φ = 414921600.

The previous prime is 665605319. The next prime is 665605327. The reversal of 665605325 is 523506566.

It is not a de Polignac number, because 665605325 - 2⁸ = 665605069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665605327) 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, 170960 + ... + 174809.

It is an arithmetic number, because the mean of its divisors is an integer number (42875480).

Almost surely, 2^665605325 is an apocalyptic number.

It is an amenable number.

665605325 is a deficient number, since it is larger than the sum of its proper divisors (363406195).

665605325 is a wasteful number, since it uses less digits than its factorization.

665605325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345797 (or 345792 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 665605325 is about 25799.3279951242. The cubic root of 665605325 is about 873.1166348349.

It can be divided in two parts, 66560 and 5325, that multiplied together give a triangular number (354432000 = T₂₆₆₂₄).

The spelling of 665605325 in words is "six hundred sixty-five million, six hundred five thousand, three hundred twenty-five".