665404245 has 48 divisors (see below), whose sum is σ = 1260410112. Its totient is φ = 322058880.

The previous prime is 665404219. The next prime is 665404249. The reversal of 665404245 is 542404566.

665404245 is a `hidden beast` number, since 6 + 6 + 5 + 404 + 245 = 666.

665404245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665404245 - 2⁵ = 665404213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665404249) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 500772 + ... + 502098.

It is an arithmetic number, because the mean of its divisors is an integer number (26258544).

Almost surely, 2^665404245 is an apocalyptic number.

It is an amenable number.

665404245 is a deficient number, since it is larger than the sum of its proper divisors (595005867).

665404245 is a wasteful number, since it uses less digits than its factorization.

665404245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 665404245 is about 25795.4307000290. The cubic root of 665404245 is about 873.0287028584.

The spelling of 665404245 in words is "six hundred sixty-five million, four hundred four thousand, two hundred forty-five".