665460225 has 24 divisors (see below), whose sum is σ = 1222476320. Its totient is φ = 354911760.

The previous prime is 665460197. The next prime is 665460227. The reversal of 665460225 is 522064566.

It is not a de Polignac number, because 665460225 - 2⁵ = 665460193 is a prime.

It is a super-2 number, since 2×665460225² = 885674622114101250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665460225.

It is not an unprimeable number, because it can be changed into a prime (665460227) 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 23 ways as a sum of consecutive naturals, for example, 492259 + ... + 493608.

Almost surely, 2^665460225 is an apocalyptic number.

It is an amenable number.

665460225 is a deficient number, since it is larger than the sum of its proper divisors (557016095).

665460225 is a wasteful number, since it uses less digits than its factorization.

665460225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985886 (or 985875 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 665460225 is about 25796.5157531012. The cubic root of 665460225 is about 873.0531846060.

The spelling of 665460225 in words is "six hundred sixty-five million, four hundred sixty thousand, two hundred twenty-five".