665562225 has 48 divisors (see below), whose sum is σ = 1138927104. Its totient is φ = 342720000.

The previous prime is 665562199. The next prime is 665562241. The reversal of 665562225 is 522265566.

It is not a de Polignac number, because 665562225 - 2¹⁵ = 665529457 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 309504 + ... + 311646.

It is an arithmetic number, because the mean of its divisors is an integer number (23727648).

Almost surely, 2^665562225 is an apocalyptic number.

It is an amenable number.

665562225 is a deficient number, since it is larger than the sum of its proper divisors (473364879).

665562225 is a wasteful number, since it uses less digits than its factorization.

665562225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2293 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 665562225 is about 25798.4926885274. The cubic root of 665562225 is about 873.0977887621.

The spelling of 665562225 in words is "six hundred sixty-five million, five hundred sixty-two thousand, two hundred twenty-five".