663245865 has 12 divisors (see below), whose sum is σ = 1149626244. Its totient is φ = 353731104.

The previous prime is 663245819. The next prime is 663245887. The reversal of 663245865 is 568542366.

663245865 is a `hidden beast` number, since 6 + 63 + 2 + 4 + 586 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181926144 + 481319721 = 13488^2 + 21939^2 .

It is not a de Polignac number, because 663245865 - 2⁶ = 663245801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14738797 = 663245865 / (6 + 6 + 3 + 2 + 4 + 5 + 8 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 663245865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7369354 + ... + 7369443.

It is an arithmetic number, because the mean of its divisors is an integer number (95802187).

Almost surely, 2^663245865 is an apocalyptic number.

It is an amenable number.

663245865 is a deficient number, since it is larger than the sum of its proper divisors (486380379).

663245865 is a wasteful number, since it uses less digits than its factorization.

663245865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14738808 (or 14738805 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 663245865 is about 25753.5602393145. The cubic root of 663245865 is about 872.0837290368.

The spelling of 663245865 in words is "six hundred sixty-three million, two hundred forty-five thousand, eight hundred sixty-five".