63665565 has 16 divisors (see below), whose sum is σ = 103094208. Its totient is φ = 33545216.

The previous prime is 63665551. The next prime is 63665573. The reversal of 63665565 is 56556636.

It is a cyclic number.

It is not a de Polignac number, because 63665565 - 2⁴ = 63665549 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 24324 + ... + 26813.

It is an arithmetic number, because the mean of its divisors is an integer number (6443388).

Almost surely, 2^63665565 is an apocalyptic number.

It is an amenable number.

63665565 is a deficient number, since it is larger than the sum of its proper divisors (39428643).

63665565 is a wasteful number, since it uses less digits than its factorization.

63665565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51228.

The product of its digits is 486000, while the sum is 42.

The square root of 63665565 is about 7979.0704345807. The cubic root of 63665565 is about 399.3020432660.

The spelling of 63665565 in words is "sixty-three million, six hundred sixty-five thousand, five hundred sixty-five".