65563999 has 4 divisors (see below), whose sum is σ = 65581936. Its totient is φ = 65546064.

The previous prime is 65563991. The next prime is 65564011. The reversal of 65563999 is 99936556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65563999 - 2³ = 65563991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65563991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1299 + ... + 11524.

It is an arithmetic number, because the mean of its divisors is an integer number (16395484).

Almost surely, 2^65563999 is an apocalyptic number.

65563999 is a deficient number, since it is larger than the sum of its proper divisors (17937).

65563999 is a wasteful number, since it uses less digits than its factorization.

65563999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17936.

The product of its digits is 1968300, while the sum is 52.

The square root of 65563999 is about 8097.1599341992. The cubic root of 65563999 is about 403.2321440180.

The spelling of 65563999 in words is "sixty-five million, five hundred sixty-three thousand, nine hundred ninety-nine".